.../filter/src/Plugin/migrate/process/FilterID.php  |  8 ++++----
 .../Kernel/Plugin/migrate/process/FilterIdTest.php  | 21 +++++++++++++++++++++
 2 files changed, 25 insertions(+), 4 deletions(-)

diff --git a/core/modules/filter/src/Plugin/migrate/process/FilterID.php b/core/modules/filter/src/Plugin/migrate/process/FilterID.php
index 69c8c44f50..9a95bfe967 100644
--- a/core/modules/filter/src/Plugin/migrate/process/FilterID.php
+++ b/core/modules/filter/src/Plugin/migrate/process/FilterID.php
@@ -223,7 +223,7 @@ protected static function getSourceFilterType($filter_id) {
       // https://www.drupal.org/project/float_filter
       case 'float_filter':
         return FilterInterface::TYPE_TRANSFORM_REVERSIBLE;
-        // https://www.drupal.org/project/footnotes
+      // https://www.drupal.org/project/footnotes
       case 'filter_footnotes':
         return FilterInterface::TYPE_TRANSFORM_IRREVERSIBLE;
       // https://www.drupal.org/project/forena
@@ -327,7 +327,7 @@ protected static function getSourceFilterType($filter_id) {
       // https://www.drupal.org/project/node_field_embed
       case 'node_field_embed':
         return FilterInterface::TYPE_TRANSFORM_IRREVERSIBLE;
-        // https://www.drupal.org/project/noindex_external_links
+      // https://www.drupal.org/project/noindex_external_links
       case 'external_links':
         return FilterInterface::TYPE_TRANSFORM_IRREVERSIBLE;
       // https://www.drupal.org/project/noreferrer
@@ -357,7 +357,7 @@ protected static function getSourceFilterType($filter_id) {
       // https://www.drupal.org/project/prettify
       case 'prettify':
         return FilterInterface::TYPE_TRANSFORM_IRREVERSIBLE;
-        // https://www.drupal.org/project/rel_to_abs
+      // https://www.drupal.org/project/rel_to_abs
       case 'rel_to_abs':
         return FilterInterface::TYPE_TRANSFORM_REVERSIBLE;
       // https://www.drupal.org/project/rollover_filter
@@ -393,7 +393,7 @@ protected static function getSourceFilterType($filter_id) {
       // https://www.drupal.org/project/spoiler
       case 'spoiler':
         return FilterInterface::TYPE_TRANSFORM_IRREVERSIBLE;
-        // https://www.drupal.org/project/tableofcontents
+      // https://www.drupal.org/project/tableofcontents
       case 'filter_toc':
         return FilterInterface::TYPE_TRANSFORM_IRREVERSIBLE;
       // https://www.drupal.org/project/tables
diff --git a/core/modules/filter/tests/src/Kernel/Plugin/migrate/process/FilterIdTest.php b/core/modules/filter/tests/src/Kernel/Plugin/migrate/process/FilterIdTest.php
index 2f8cee39bc..3578add647 100644
--- a/core/modules/filter/tests/src/Kernel/Plugin/migrate/process/FilterIdTest.php
+++ b/core/modules/filter/tests/src/Kernel/Plugin/migrate/process/FilterIdTest.php
@@ -5,6 +5,7 @@
 use Drupal\filter\Plugin\migrate\process\FilterID;
 use Drupal\KernelTests\KernelTestBase;
 use Drupal\migrate\MigrateExecutableInterface;
+use Drupal\migrate\MigrateSkipProcessException;
 use Drupal\migrate\Plugin\MigrationInterface;
 use Drupal\migrate\Row;
 
@@ -61,6 +62,18 @@ public function testTransform($value, $expected_value, $invalid_id = NULL) {
     ];
     $plugin = FilterID::create($this->container, $configuration, 'filter_id', []);
 
+    if ($expected_value instanceof MigrateSkipProcessException) {
+      $this->executable
+        ->expects($this->exactly(1))
+        ->method('saveMessage')
+        ->with(
+          sprintf('Filter %s could not be mapped to an existing filter plugin; omitted since it is a transformation-only filter. Install and configure a successor after the migration.', $value),
+          MigrationInterface::MESSAGE_INFORMATIONAL
+        );
+      $this->expectException(MigrateSkipProcessException::class);
+      $this->expectExceptionMessage(sprintf("The transformation-only filter %s was skipped.", $value));
+    }
+
     if (isset($invalid_id)) {
       $this->executable
         ->expects($this->exactly(1))
@@ -110,6 +123,14 @@ public function provideFilters() {
         'filter_null',
         'filter:1',
       ],
+      'transformation-only D7 contrib filter' => [
+        'editor_align',
+        new MigrateSkipProcessException('The transformation-only filter editor_align was skipped.'),
+      ],
+      'non-transformation-only D7 contrib filter' => [
+        'bbcode',
+        'filter_null',
+      ],
     ];
   }