diff --git a/core/modules/config/tests/config_schema_test/config/schema/config_schema_test.schema.yml b/core/modules/config/tests/config_schema_test/config/schema/config_schema_test.schema.yml
index 94889f7..ce894c2 100644
--- a/core/modules/config/tests/config_schema_test/config/schema/config_schema_test.schema.yml
+++ b/core/modules/config/tests/config_schema_test/config/schema/config_schema_test.schema.yml
@@ -315,3 +315,23 @@ config_schema_test.schema_sequence_sort:
       type: sequence
       sequence:
         - type: string
+    complex_sort_value:
+      type: sequence
+      orderby: value
+      sequence:
+        - type: mapping
+          mapping:
+            foo:
+              type: string
+            bar:
+              type: string
+    complex_sort_key:
+      type: sequence
+      orderby: key
+      sequence:
+        - type: mapping
+          mapping:
+            foo:
+              type: string
+            bar:
+              type: string
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigSchemaTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigSchemaTest.php
index fb53ab7..158854c 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigSchemaTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigSchemaTest.php
@@ -440,6 +440,29 @@ public function testConfigSaveWithSequenceSorting() {
 
     $this->assertSame(['a', 'b'], $this->config('config_schema_test.schema_sequence_sort')->get('value_sort'));
     $this->assertSame([1 => 'b', 2 => 'a'], $this->config('config_schema_test.schema_sequence_sort')->get('no_sort'));
+
+    // Tests sorts do never destroy complex values.
+    $data = [
+      'complex_sort_value' => [['foo' => 'b', 'bar' => 'b'] , ['foo' => 'a', 'bar' => 'a']],
+      'complex_sort_key' => ['b' => ['foo' => '1', 'bar' => '1'] , 'a' => ['foo' => '2', 'bar' => '2']],
+    ];
+    $this->config('config_schema_test.schema_sequence_sort')
+      ->setData($data)
+      ->save();
+    $this->assertSame([['foo' => 'a', 'bar' => 'a'], ['foo' => 'b', 'bar' => 'b']], $this->config('config_schema_test.schema_sequence_sort')->get('complex_sort_value'));
+    $this->assertSame(['a' => ['foo' => '2', 'bar' => '2'], 'b' => ['foo' => '1', 'bar' => '1']], $this->config('config_schema_test.schema_sequence_sort')->get('complex_sort_key'));
+
+    // Swap the previous test scenario around.
+    $data = [
+      'complex_sort_value' => ['b' => ['foo' => '1', 'bar' => '1'] , 'a' => ['foo' => '2', 'bar' => '2']],
+      'complex_sort_key' => [['foo' => 'b', 'bar' => 'b'] , ['foo' => 'a', 'bar' => 'a']],
+    ];
+    $this->config('config_schema_test.schema_sequence_sort')
+      ->setData($data)
+      ->save();
+    $this->assertSame([['foo' => '1', 'bar' => '1'], ['foo' => '2', 'bar' => '2']], $this->config('config_schema_test.schema_sequence_sort')->get('complex_sort_value'));
+    $this->assertSame([['foo' => 'b', 'bar' => 'b'], ['foo' => 'a', 'bar' => 'a']], $this->config('config_schema_test.schema_sequence_sort')->get('complex_sort_key'));
+
   }
 
   /**