Joomla returns to "nowhere" when the article is checked out. Frontend must return to the page calling the edit.
Better would be to modify the legacy form controller to handle frontend correct and not as
Quote // Check-out failed, display a notice but allow the user to see the record.
Tested successful - Thanks @schnuti
Looking at the issue on Joomla code, this has been tested successfully by others there too. You may blame the J!Tracker Application for transmitting this comment.
thanks @schnuti i have tested this successfull.