diff --git a/src/Plugin/migrate/field/FieldCollection.php b/src/Plugin/migrate/field/FieldCollection.php
index 938ece0..f0c8a13 100644
--- a/src/Plugin/migrate/field/FieldCollection.php
+++ b/src/Plugin/migrate/field/FieldCollection.php
@@ -40,8 +40,17 @@ class FieldCollection extends ParagraphsFieldPluginBase {
    */
   public function defineValueProcessPipeline(MigrationInterface $migration, $field_name, $data) {
     $process = [
+      // The "paragraphs_delta_sort" plugin sorts field values for PostgreSQL
+      // sources.
+      // @see \Drupal\paragraphs\Plugin\migrate\process\ParagraphsDeltaSort
+      // @todo remove when https://drupal.org/i/3164520 is fixed.
+      [
+        'plugin' => 'paragraphs_delta_sort',
+        'source' => $field_name,
+      ],
+    ];
+    $process[] = [
       'plugin' => 'sub_process',
-      'source' => $field_name,
       'process' => [
         'target_id' => [
           [
diff --git a/src/Plugin/migrate/field/Paragraphs.php b/src/Plugin/migrate/field/Paragraphs.php
index dc48412..0bfb99b 100644
--- a/src/Plugin/migrate/field/Paragraphs.php
+++ b/src/Plugin/migrate/field/Paragraphs.php
@@ -40,8 +40,17 @@ class Paragraphs extends ParagraphsFieldPluginBase {
    */
   public function defineValueProcessPipeline(MigrationInterface $migration, $field_name, $data) {
     $process = [
+      // The "paragraphs_delta_sort" plugin sorts field values for PostgreSQL
+      // sources.
+      // @see \Drupal\paragraphs\Plugin\migrate\process\ParagraphsDeltaSort
+      // @todo remove when https://drupal.org/i/3164520 is fixed.
+      [
+        'plugin' => 'paragraphs_delta_sort',
+        'source' => $field_name,
+      ],
+    ];
+    $process[] = [
       'plugin' => 'sub_process',
-      'source' => $field_name,
       'process' => [
         'target_id' => [
           [
diff --git a/src/Plugin/migrate/process/ParagraphsDeltaSort.php b/src/Plugin/migrate/process/ParagraphsDeltaSort.php
new file mode 100644
index 0000000..6f70372
--- /dev/null
+++ b/src/Plugin/migrate/process/ParagraphsDeltaSort.php
@@ -0,0 +1,38 @@
+<?php
+
+namespace Drupal\paragraphs\Plugin\migrate\process;
+
+use Drupal\migrate\MigrateExecutableInterface;
+use Drupal\migrate\ProcessPluginBase;
+use Drupal\migrate\Row;
+
+/**
+ * Process plugin for sorting multi-value field values' by their delta.
+ *
+ * No configuration available.
+ *
+ * This plugin is required only because Drupal core's
+ * FieldableEntity::getFieldValues() does not guarantee that the returned
+ * field values are sorted by their delta, so when the source Drupal database
+ * is PostgreSQL, the values of some multi-value fields are migrated in reversed
+ * order.
+ * @todo remove when https://drupal.org/i/3164520 is fixed for all supported
+ *   Drupal core release.
+ *
+ * @MigrateProcessPlugin(
+ *   id = "paragraphs_delta_sort",
+ *   handle_multiples = TRUE
+ * )
+ */
+class ParagraphsDeltaSort extends ProcessPluginBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function transform($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) {
+    $value = (array) $value;
+    ksort($value);
+    return $value;
+  }
+
+}
diff --git a/tests/src/Functional/Migrate/MigrateUiParagraphsTestBase.php b/tests/src/Functional/Migrate/MigrateUiParagraphsTestBase.php
index 9aa7162..b5646a8 100644
--- a/tests/src/Functional/Migrate/MigrateUiParagraphsTestBase.php
+++ b/tests/src/Functional/Migrate/MigrateUiParagraphsTestBase.php
@@ -47,9 +47,11 @@ abstract class MigrateUiParagraphsTestBase extends MigrateUpgradeTestBase {
   /**
    * Gets the expected entity IDs and labels per entity type after migration.
    *
-   * @return string|null[][]
+   * @return mixed[][]
    *   An array of expected entity labels keyed by IDs, grouped by entity type
-   *   ID. For some of the entities, label can be NULL.
+   *   ID. For some of the entities, label can be NULL. When all of the given
+   *   entity IDs are numbers, then only the existence of the given labels is
+   *   checked.
    */
   protected function getExpectedEntities() {
     $expected_entities = [
@@ -283,14 +285,14 @@ abstract class MigrateUiParagraphsTestBase extends MigrateUpgradeTestBase {
         'test_content_type' => 'Test content type',
       ],
       'node' => [
-        1 => 'A Node',
-        2 => 'The thing about Deep Space 9',
-        4 => 'is - The thing about Firefly',
-        6 => 'Comments are closed :-(',
-        7 => 'Comments are open :-)',
-        8 => 'Paragraph Migration Test Content UND',
-        9 => 'Paragraph Migration Test Content EN',
-        11 => 'Content with nested paragraphs ENG',
+        '1' => 'A Node',
+        '2' => 'The thing about Deep Space 9',
+        '4' => 'is - The thing about Firefly',
+        '6' => 'Comments are closed :-(',
+        '7' => 'Comments are open :-)',
+        '8' => 'Paragraph Migration Test Content UND',
+        '9' => 'Paragraph Migration Test Content EN',
+        '11' => 'Content with nested paragraphs ENG',
       ],
       'paragraphs_type' => [
         'field_collection_test' => 'Field collection test',
@@ -307,28 +309,28 @@ abstract class MigrateUiParagraphsTestBase extends MigrateUpgradeTestBase {
       // migration.
       // @see https://www.drupal.org/node/3105503
       'paragraph' => [
-        1 => 'Paragraph Migration Test Content UND > Field Collection Test',
-        2 => 'Paragraph Migration Test Content UND > Field Collection Test',
-        3 => 'Paragraph Migration Test Content EN > Field Collection Test',
-        4 => 'Paragraph Migration Test Content EN > Field Collection Test (previous revision)',
-        5 => 'Paragraph Migration Test Content EN > Field Collection Test (previous revision)',
-        6 => 'Paragraph Migration Test Content EN > Field Collection Test (previous revision)',
-        7 => 'Paragraph Migration Test Content UND > Nested FC Outer > Nested FC Inner',
-        8 => 'Paragraph Migration Test Content UND > Nested FC Outer',
-        9 => 'Content with nested paragraphs ENG > Any Paragraph > Any Paragraph (nested)',
-        10 => 'Content with nested paragraphs ENG > Any Paragraph > Any Paragraph (nested)',
-        11 => 'Content with nested paragraphs ENG > Any Paragraph',
-        12 => 'Paragraph Migration Test Content UND > Any Paragraph',
-        13 => 'Paragraph Migration Test Content EN > Any Paragraph',
-        14 => 'Paragraph Migration Test Content EN > Any Paragraph (previous revision)',
-        15 => 'Paragraph Migration Test Content UND > Any Paragraph',
-        16 => 'Paragraph Migration Test Content EN > Any Paragraph',
-        17 => 'Paragraph Migration Test Content EN > Any Paragraph (previous revision)',
-        18 => 'Paragraph Migration Test Content EN > Any Paragraph (previous revision)',
-        19 => 'Content with nested paragraphs ENG > Any Paragraph',
-        20 => 'Paragraph Migration Test Content UND > Paragraph One Only',
-        21 => 'Paragraph Migration Test Content EN > Paragraph One Only',
-        22 => 'Paragraph Migration Test Content EN > Paragraph One Only (previous revision)',
+        'Content with nested paragraphs ENG > Any Paragraph',
+        'Content with nested paragraphs ENG > Any Paragraph',
+        'Content with nested paragraphs ENG > Any Paragraph > Any Paragraph (nested)',
+        'Content with nested paragraphs ENG > Any Paragraph > Any Paragraph (nested)',
+        'Paragraph Migration Test Content EN > Any Paragraph',
+        'Paragraph Migration Test Content EN > Any Paragraph',
+        'Paragraph Migration Test Content EN > Any Paragraph (previous revision)',
+        'Paragraph Migration Test Content EN > Any Paragraph (previous revision)',
+        'Paragraph Migration Test Content EN > Any Paragraph (previous revision)',
+        'Paragraph Migration Test Content EN > Field Collection Test',
+        'Paragraph Migration Test Content EN > Field Collection Test (previous revision)',
+        'Paragraph Migration Test Content EN > Field Collection Test (previous revision)',
+        'Paragraph Migration Test Content EN > Field Collection Test (previous revision)',
+        'Paragraph Migration Test Content EN > Paragraph One Only',
+        'Paragraph Migration Test Content EN > Paragraph One Only (previous revision)',
+        'Paragraph Migration Test Content UND > Any Paragraph',
+        'Paragraph Migration Test Content UND > Any Paragraph',
+        'Paragraph Migration Test Content UND > Field Collection Test',
+        'Paragraph Migration Test Content UND > Field Collection Test',
+        'Paragraph Migration Test Content UND > Nested FC Outer',
+        'Paragraph Migration Test Content UND > Nested FC Outer > Nested FC Inner',
+        'Paragraph Migration Test Content UND > Paragraph One Only',
       ],
     ];
 
@@ -336,30 +338,30 @@ abstract class MigrateUiParagraphsTestBase extends MigrateUpgradeTestBase {
     // @todo Should we test the legacy method anyway?
     if (ParagraphsMigration::getParagraphsMigrationDerivationMethod() === ParagraphsMigration::DERIVATION_STRATEGY_LEGACY) {
       $expected_entities['paragraph'] = [
-        1 => 'Paragraph Migration Test Content UND > Field Collection Test',
-        2 => 'Paragraph Migration Test Content UND > Field Collection Test',
-        3 => 'Paragraph Migration Test Content EN > Field Collection Test',
-        4 => 'Paragraph Migration Test Content EN > Field Collection Test (previous revision)',
-        5 => 'Paragraph Migration Test Content EN > Field Collection Test (previous revision)',
-        6 => 'Paragraph Migration Test Content EN > Field Collection Test (previous revision)',
-        7 => 'Content with nested paragraphs ENG > Any Paragraph > Any Paragraph (nested)',
-        8 => 'Content with nested paragraphs ENG > Any Paragraph > Any Paragraph (nested)',
-        9 => 'Content with nested paragraphs ENG > Any Paragraph',
-        10 => 'Paragraph Migration Test Content EN > Any Paragraph (previous revision)',
-        11 => 'Paragraph Migration Test Content UND > Any Paragraph',
-        12 => 'Paragraph Migration Test Content UND > Paragraph One Only',
-        13 => 'Paragraph Migration Test Content EN > Any Paragraph',
-        14 => 'Paragraph Migration Test Content EN > Paragraph One Only',
-        15 => 'Paragraph Migration Test Content EN > Paragraph One Only (previous revision)',
-        16 => 'Orphaned Paragraph Bundle One: Nested Paragraph Bundle One ENG with &amp;#039;The la…',
-        17 => 'Paragraph Migration Test Content UND > Any Paragraph',
-        18 => 'Paragraph Migration Test Content EN > Any Paragraph',
-        19 => 'Paragraph Migration Test Content EN > Any Paragraph (previous revision)',
-        20 => 'Paragraph Migration Test Content EN > Any Paragraph (previous revision)',
-        21 => 'Content with nested paragraphs ENG > Any Paragraph',
-        22 => 'Orphaned Paragraph Bundle Two: Nested Paragraph Bundle Two ENG',
-        23 => 'Paragraph Migration Test Content UND > Nested FC Outer > Nested FC Inner',
-        24 => 'Paragraph Migration Test Content UND > Nested FC Outer',
+        'Content with nested paragraphs ENG > Any Paragraph',
+        'Content with nested paragraphs ENG > Any Paragraph',
+        'Content with nested paragraphs ENG > Any Paragraph > Any Paragraph (nested)',
+        'Content with nested paragraphs ENG > Any Paragraph > Any Paragraph (nested)',
+        'Orphaned Paragraph Bundle One: Nested Paragraph Bundle One ENG with &amp;#039;The la…',
+        'Orphaned Paragraph Bundle Two: Nested Paragraph Bundle Two ENG',
+        'Paragraph Migration Test Content EN > Any Paragraph',
+        'Paragraph Migration Test Content EN > Any Paragraph',
+        'Paragraph Migration Test Content EN > Any Paragraph (previous revision)',
+        'Paragraph Migration Test Content EN > Any Paragraph (previous revision)',
+        'Paragraph Migration Test Content EN > Any Paragraph (previous revision)',
+        'Paragraph Migration Test Content EN > Field Collection Test',
+        'Paragraph Migration Test Content EN > Field Collection Test (previous revision)',
+        'Paragraph Migration Test Content EN > Field Collection Test (previous revision)',
+        'Paragraph Migration Test Content EN > Field Collection Test (previous revision)',
+        'Paragraph Migration Test Content EN > Paragraph One Only',
+        'Paragraph Migration Test Content EN > Paragraph One Only (previous revision)',
+        'Paragraph Migration Test Content UND > Any Paragraph',
+        'Paragraph Migration Test Content UND > Any Paragraph',
+        'Paragraph Migration Test Content UND > Field Collection Test',
+        'Paragraph Migration Test Content UND > Field Collection Test',
+        'Paragraph Migration Test Content UND > Nested FC Outer',
+        'Paragraph Migration Test Content UND > Nested FC Outer > Nested FC Inner',
+        'Paragraph Migration Test Content UND > Paragraph One Only',
       ];
     }
 
@@ -368,58 +370,58 @@ abstract class MigrateUiParagraphsTestBase extends MigrateUpgradeTestBase {
     // migrated separately.
     if (Settings::get('migrate_node_migrate_type_classic', FALSE)) {
       $expected_entities['paragraph'] = [
-        1 => 'Paragraph Migration Test Content UND > Field Collection Test (previous revision)',
-        2 => 'Paragraph Migration Test Content UND > Field Collection Test (previous revision)',
-        3 => 'Paragraph Migration Test Content EN > Field Collection Test',
-        4 => 'Paragraph Migration Test Content EN > Field Collection Test (previous revision)',
-        5 => 'Paragraph Migration Test Content EN > Field Collection Test (previous revision)',
-        6 => 'Paragraph Migration Test Content EN > Field Collection Test (previous revision)',
-        7 => 'Paragraph Migration Test Content UND > Nested FC Outer > Nested FC Inner',
-        8 => 'Paragraph Migration Test Content UND > Nested FC Outer',
-        9 => 'Content with nested paragraphs ENG > Any Paragraph > Any Paragraph (nested)',
-        10 => 'Content with nested paragraphs ENG > Any Paragraph > Any Paragraph (nested)',
-        11 => 'Content with nested paragraphs ENG > Any Paragraph',
-        12 => 'Paragraph Migration Test Content UND > Any Paragraph (previous revision)',
-        13 => 'Paragraph Migration Test Content EN > Any Paragraph',
-        14 => 'Paragraph Migration Test Content EN > Any Paragraph (previous revision)',
-        15 => 'Paragraph Migration Test Content UND > Any Paragraph (previous revision)',
-        16 => 'Paragraph Migration Test Content EN > Any Paragraph',
-        17 => 'Paragraph Migration Test Content EN > Any Paragraph (previous revision)',
-        18 => 'Paragraph Migration Test Content EN > Any Paragraph (previous revision)',
-        19 => 'Content with nested paragraphs ENG > Any Paragraph',
-        20 => 'Paragraph Migration Test Content UND > Paragraph One Only (previous revision)',
-        21 => 'Paragraph Migration Test Content EN > Paragraph One Only',
-        22 => 'Paragraph Migration Test Content EN > Paragraph One Only (previous revision)',
+        'Content with nested paragraphs ENG > Any Paragraph',
+        'Content with nested paragraphs ENG > Any Paragraph',
+        'Content with nested paragraphs ENG > Any Paragraph > Any Paragraph (nested)',
+        'Content with nested paragraphs ENG > Any Paragraph > Any Paragraph (nested)',
+        'Paragraph Migration Test Content EN > Any Paragraph',
+        'Paragraph Migration Test Content EN > Any Paragraph',
+        'Paragraph Migration Test Content EN > Any Paragraph (previous revision)',
+        'Paragraph Migration Test Content EN > Any Paragraph (previous revision)',
+        'Paragraph Migration Test Content EN > Any Paragraph (previous revision)',
+        'Paragraph Migration Test Content EN > Field Collection Test',
+        'Paragraph Migration Test Content EN > Field Collection Test (previous revision)',
+        'Paragraph Migration Test Content EN > Field Collection Test (previous revision)',
+        'Paragraph Migration Test Content EN > Field Collection Test (previous revision)',
+        'Paragraph Migration Test Content EN > Paragraph One Only',
+        'Paragraph Migration Test Content EN > Paragraph One Only (previous revision)',
+        'Paragraph Migration Test Content UND > Any Paragraph (previous revision)',
+        'Paragraph Migration Test Content UND > Any Paragraph (previous revision)',
+        'Paragraph Migration Test Content UND > Field Collection Test (previous revision)',
+        'Paragraph Migration Test Content UND > Field Collection Test (previous revision)',
+        'Paragraph Migration Test Content UND > Nested FC Outer',
+        'Paragraph Migration Test Content UND > Nested FC Outer > Nested FC Inner',
+        'Paragraph Migration Test Content UND > Paragraph One Only (previous revision)',
       ];
 
       // The 'legacy' derivation methods ends up in orphaned paragraphs.
       // @todo Should we test the legacy method anyway?
       if (ParagraphsMigration::getParagraphsMigrationDerivationMethod() === ParagraphsMigration::DERIVATION_STRATEGY_LEGACY) {
         $expected_entities['paragraph'] = [
-          1 => 'Paragraph Migration Test Content UND > Field Collection Test (previous revision)',
-          2 => 'Paragraph Migration Test Content UND > Field Collection Test (previous revision)',
-          3 => 'Paragraph Migration Test Content EN > Field Collection Test',
-          4 => 'Paragraph Migration Test Content EN > Field Collection Test (previous revision)',
-          5 => 'Paragraph Migration Test Content EN > Field Collection Test (previous revision)',
-          6 => 'Paragraph Migration Test Content EN > Field Collection Test (previous revision)',
-          7 => 'Content with nested paragraphs ENG > Any Paragraph > Any Paragraph (nested)',
-          8 => 'Content with nested paragraphs ENG > Any Paragraph > Any Paragraph (nested)',
-          9 => 'Content with nested paragraphs ENG > Any Paragraph',
-          10 => 'Paragraph Migration Test Content EN > Any Paragraph (previous revision)',
-          11 => 'Paragraph Migration Test Content UND > Any Paragraph (previous revision)',
-          12 => 'Paragraph Migration Test Content UND > Paragraph One Only (previous revision)',
-          13 => 'Paragraph Migration Test Content EN > Any Paragraph',
-          14 => 'Paragraph Migration Test Content EN > Paragraph One Only',
-          15 => 'Paragraph Migration Test Content EN > Paragraph One Only (previous revision)',
-          16 => 'Orphaned Paragraph Bundle One: Nested Paragraph Bundle One ENG with &amp;#039;The la…',
-          17 => 'Paragraph Migration Test Content UND > Any Paragraph (previous revision)',
-          18 => 'Paragraph Migration Test Content EN > Any Paragraph',
-          19 => 'Paragraph Migration Test Content EN > Any Paragraph (previous revision)',
-          20 => 'Paragraph Migration Test Content EN > Any Paragraph (previous revision)',
-          21 => 'Content with nested paragraphs ENG > Any Paragraph',
-          22 => 'Orphaned Paragraph Bundle Two: Nested Paragraph Bundle Two ENG',
-          23 => 'Paragraph Migration Test Content UND > Nested FC Outer > Nested FC Inner',
-          24 => 'Paragraph Migration Test Content UND > Nested FC Outer',
+          'Content with nested paragraphs ENG > Any Paragraph',
+          'Content with nested paragraphs ENG > Any Paragraph',
+          'Content with nested paragraphs ENG > Any Paragraph > Any Paragraph (nested)',
+          'Content with nested paragraphs ENG > Any Paragraph > Any Paragraph (nested)',
+          'Orphaned Paragraph Bundle One: Nested Paragraph Bundle One ENG with &amp;#039;The la…',
+          'Orphaned Paragraph Bundle Two: Nested Paragraph Bundle Two ENG',
+          'Paragraph Migration Test Content EN > Any Paragraph',
+          'Paragraph Migration Test Content EN > Any Paragraph',
+          'Paragraph Migration Test Content EN > Any Paragraph (previous revision)',
+          'Paragraph Migration Test Content EN > Any Paragraph (previous revision)',
+          'Paragraph Migration Test Content EN > Any Paragraph (previous revision)',
+          'Paragraph Migration Test Content EN > Field Collection Test',
+          'Paragraph Migration Test Content EN > Field Collection Test (previous revision)',
+          'Paragraph Migration Test Content EN > Field Collection Test (previous revision)',
+          'Paragraph Migration Test Content EN > Field Collection Test (previous revision)',
+          'Paragraph Migration Test Content EN > Paragraph One Only',
+          'Paragraph Migration Test Content EN > Paragraph One Only (previous revision)',
+          'Paragraph Migration Test Content UND > Any Paragraph (previous revision)',
+          'Paragraph Migration Test Content UND > Any Paragraph (previous revision)',
+          'Paragraph Migration Test Content UND > Field Collection Test (previous revision)',
+          'Paragraph Migration Test Content UND > Field Collection Test (previous revision)',
+          'Paragraph Migration Test Content UND > Nested FC Outer',
+          'Paragraph Migration Test Content UND > Nested FC Outer > Nested FC Inner',
+          'Paragraph Migration Test Content UND > Paragraph One Only (previous revision)',
         ];
       }
     }
@@ -584,6 +586,14 @@ abstract class MigrateUiParagraphsTestBase extends MigrateUpgradeTestBase {
           $carry[$entity->id()] = (string) $entity->label();
           return $carry;
         });
+
+        if (count(array_filter(array_keys($expected_entity_labels), 'is_int')) === count($expected_entity_labels)) {
+         sort($expected_entity_labels);
+         $expected_entity_labels = array_values($expected_entity_labels);
+         sort($actual_labels);
+         $actual_labels = array_values($actual_labels);
+        }
+
         $this->assertEquals($expected_entity_labels, $actual_labels, sprintf('The expected %s entities are not matching the actual ones.', $entity_type_id));
       }
       else {