diff --git a/core/modules/ckeditor5/src/SmartDefaultSettings.php b/core/modules/ckeditor5/src/SmartDefaultSettings.php
index a10a64b2133e2188c45b26facc900d71cc0a8a53..9da23d1aba1eca47e92c6d6a784a35a3633544a8 100644
--- a/core/modules/ckeditor5/src/SmartDefaultSettings.php
+++ b/core/modules/ckeditor5/src/SmartDefaultSettings.php
@@ -178,39 +178,40 @@ public function computeSmartDefaultSettings(?EditorInterface $text_editor, Filte
       $unsupported = $missing->diff($missing_attributes);
 
       if ($enabling_message_content) {
-        $this->logger->info(new FormattableMarkup('The CKEditor 5 migration enabled the following plugins to support tags that are allowed by the %text_format text format: %enabling_message_content. The text format must be saved to make these changes active.',
+        $this->logger->info('The CKEditor 5 migration enabled the following plugins to support tags that are allowed by the %text_format text format: %enabling_message_content. The text format must be saved to make these changes active.',
           [
             '%text_format' => $editor->getFilterFormat()->get('name'),
             '%enabling_message_content' => $enabling_message_content,
-          ],
-        ));
+          ]
+        );
       }
+
       // Warn user about unsupported tags.
       if (!$unsupported->allowsNothing()) {
         $this->addTagsToSourceEditing($editor, $unsupported);
         $source_editing_additions = $source_editing_additions->merge($unsupported);
-        $this->logger->info(new FormattableMarkup("The following tags were permitted by the %text_format text format's filter configuration, but no plugin was available that supports them. To ensure the tags remain supported by this text format, the following were added to the Source Editing plugin's <em>Manually editable HTML tags</em>: @unsupported_string. The text format must be saved to make these changes active.", [
+        $this->logger->info("The following tags were permitted by the %text_format text format's filter configuration, but no plugin was available that supports them. To ensure the tags remain supported by this text format, the following were added to the Source Editing plugin's <em>Manually editable HTML tags</em>: @unsupported_string. The text format must be saved to make these changes active.", [
           '%text_format' => $editor->getFilterFormat()->get('name'),
           '@unsupported_string' => $unsupported->toFilterHtmlAllowedTagsString(),
-        ]));
+        ]);
       }
 
       if ($enabled_for_attributes_message_content) {
-        $this->logger->info(new FormattableMarkup('The CKEditor 5 migration process enabled the following plugins to support specific attributes that are allowed by the %text_format text format: %enabled_for_attributes_message_content.',
+        $this->logger->info('The CKEditor 5 migration process enabled the following plugins to support specific attributes that are allowed by the %text_format text format: %enabled_for_attributes_message_content.',
           [
             '%text_format' => $editor->getFilterFormat()->get('name'),
             '%enabled_for_attributes_message_content' => $enabled_for_attributes_message_content,
           ],
-        ));
+        );
       }
       // Warn user about supported tags but missing attributes.
       if (!$missing_attributes->allowsNothing()) {
         $this->addTagsToSourceEditing($editor, $missing_attributes);
         $source_editing_additions = $source_editing_additions->merge($missing_attributes);
-        $this->logger->info(new FormattableMarkup("As part of migrating to CKEditor 5, it was found that the %text_format text format's HTML filters includes plugins that support the following tags, but not some of their attributes. To ensure these attributes remain supported, the following were added to the Source Editing plugin's <em>Manually editable HTML tags</em>: @missing_attributes. The text format must be saved to make these changes active.", [
+        $this->logger->info("As part of migrating to CKEditor 5, it was found that the %text_format text format's HTML filters includes plugins that support the following tags, but not some of their attributes. To ensure these attributes remain supported, the following were added to the Source Editing plugin's <em>Manually editable HTML tags</em>: @missing_attributes. The text format must be saved to make these changes active.", [
           '%text_format' => $editor->getFilterFormat()->get('name'),
           '@missing_attributes' => $missing_attributes->toFilterHtmlAllowedTagsString(),
-        ]));
+        ]);
       }
     }
 
@@ -225,10 +226,10 @@ public function computeSmartDefaultSettings(?EditorInterface $text_editor, Filte
       $missing_fundamental_tags = $fundamental->diff($filter_html_restrictions);
       if (!$missing_fundamental_tags->allowsNothing()) {
         $editor->getFilterFormat()->setFilterConfig('filter_html', $filter_html_restrictions->merge($fundamental)->getAllowedElements());
-        $this->logger->warning(new FormattableMarkup("As part of migrating the %text_format text format to CKEditor 5, the following tag(s) were added to <em>Limit allowed HTML tags and correct faulty HTML</em>, because they are needed to provide fundamental CKEditor 5 functionality : @missing_tags. The text format must be saved to make these changes active.", [
+        $this->logger->warning("As part of migrating the %text_format text format to CKEditor 5, the following tag(s) were added to <em>Limit allowed HTML tags and correct faulty HTML</em>, because they are needed to provide fundamental CKEditor 5 functionality : @missing_tags. The text format must be saved to make these changes active.", [
           '%text_format' => $editor->getFilterFormat()->get('name'),
           '@missing_tags' => $missing_fundamental_tags->toFilterHtmlAllowedTagsString(),
-        ]));
+        ]);
       }
     }
 
@@ -448,9 +449,9 @@ private function createSettingsFromCKEditor4(array $ckeditor4_settings, HTMLRest
             $equivalent = $this->upgradePluginManager->mapCKEditor4ToolbarButtonToCKEditor5ToolbarItem($cke4_button, $text_format_html_restrictions);
           }
           catch (\OutOfBoundsException $e) {
-            $this->logger->warning(new FormattableMarkup('The CKEditor 4 button %button does not have a known upgrade path. If it allowed editing markup, then you can do so now through the Source Editing functionality.', [
+            $this->logger->warning('The CKEditor 4 button %button does not have a known upgrade path. If it allowed editing markup, then you can do so now through the Source Editing functionality.', [
               '%button' => $cke4_button,
-            ]));
+            ]);
             $messages[MessengerInterface::TYPE_WARNING][] = $this->t('The CKEditor 4 button %button does not have a known upgrade path. If it allowed editing markup, then you can do so now through the Source Editing functionality.', [
               '%button' => $cke4_button,
             ]);
@@ -489,9 +490,9 @@ private function createSettingsFromCKEditor4(array $ckeditor4_settings, HTMLRest
         $settings['plugins'] += $cke5_plugin_settings;
       }
       catch (\OutOfBoundsException $e) {
-        $this->logger->warning(new FormattableMarkup('The %cke4_plugin_id plugin settings do not have a known upgrade path.', [
+        $this->logger->warning('The %cke4_plugin_id plugin settings do not have a known upgrade path.', [
           '%cke4_plugin_id' => $cke4_plugin_id,
-        ]));
+        ]);
         $messages[MessengerInterface::TYPE_WARNING][] = $this->t('The %cke4_plugin_id plugin settings do not have a known upgrade path.', [
           '%cke4_plugin_id' => $cke4_plugin_id,
         ]);
diff --git a/core/modules/ckeditor5/tests/src/Kernel/SmartDefaultSettingsTest.php b/core/modules/ckeditor5/tests/src/Kernel/SmartDefaultSettingsTest.php
index 203131afb7131e41953e0c63b9c5558f4dd724e8..ac588ff9d6deb0eb9644ef09c58524c7085ef922 100644
--- a/core/modules/ckeditor5/tests/src/Kernel/SmartDefaultSettingsTest.php
+++ b/core/modules/ckeditor5/tests/src/Kernel/SmartDefaultSettingsTest.php
@@ -5,6 +5,7 @@
 namespace Drupal\Tests\ckeditor5\Kernel;
 
 use Drupal\ckeditor5\HTMLRestrictions;
+use Drupal\Component\Render\FormattableMarkup;
 use Drupal\Component\Utility\NestedArray;
 use Drupal\Core\Entity\Entity\EntityViewMode;
 use Drupal\editor\Entity\Editor;
@@ -576,7 +577,9 @@ public function test(string $format_id, array $filters_to_drop, array $expected_
     ];
     $db_logs = [];
     foreach ($db_logged as $log) {
-      $db_logs[$type_to_status[$log->severity]][] = $log->message;
+      $variables = unserialize($log->variables);
+      $message = new FormattableMarkup($log->message, $variables);
+      $db_logs[$type_to_status[$log->severity]][] = (string) $message;
     }
 
     // Transforms TranslatableMarkup objects to string.