Issue #3524614 by gigimaor: Error on Transition Timestamp - no owner in the default value

src/Entity/WorkflowTransition.php

@@ -1130,6 +1130,8 @@ class WorkflowTransition extends ContentEntityBase implements WorkflowTransition
     $fields += static::ownerBaseFieldDefinitions($entity_type);
     $fields['uid']
       ->setDescription(t('The user ID of the transition author.'))
+      // ->setDefaultValueCallback('workflow_current_user')
+      ->setDefaultValueCallback(static::class . '::getDefaultEntityOwner')
       ->setRevisionable(TRUE);
 
     $fields['from_sid'] = BaseFieldDefinition::create('list_string')