Updater Extra Files found but List is empty

I have a little Problem to update my Nextcloud to 12.0.4.
The updater Stop withe the “Some extra files have been found”-Error but the List of extra files shows nothing. Only one List-Dot.

The same result is shown in the command based updater.phar. There is shown nothong aufter the doubledot from the Error

I have following files in my webroot directory:

Do you have an Idea for me what can i do?

Thank you