After a further test with a new virtual machine (OS Rocky) and Samba-AD as account provider, I can confirm that all applications that previously did not work under Debian 12 are running flawlessly and at a good speed. At the moment these are Collabora, Mailserver, Mattermost, Nextcloud and Webtop. Opening documents with Collabora works well. I installed Webtop normally from the software center and not with the command that @stephdl posted here.
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