Hello
Thanks for your reply. I did further investigations last night. Isolation showed that most recent submissions didn't appear at all, raising the same error. According the submission date I was able to identify the date after which the error occured. It was the time when I installed and tested the flag module - which unfortunately didn't let being uninstalled as there were six flagged submissions in place and it was not possible to delete them (AJAX-http-error 200). I had to remove these six flags from the database, then removed the flag filter criteria from the view, disabled the module (4.0@beta, installed via composer). Now sorting works as before - ascending and descending.
Is there a way to route this notice to the flag module tracker queue? Does it even make sense, as there is no debug data available anymore?
Kind regards, Daniel