Interesting. Thanks for the update. I also notice that no sound via standard PulseAudio (which previously worked) is transmitted to the client anymore from any remote machine (default port 4713, SSH port forwarding). Is that related to this bug here too? https://bugs.launchpad.net/ubuntu/+source/libssh/+bug/1856795 or something else that requires looking into?
Very likely, yes. We use scp to transfer some files (including the cookie file), so if scp is broken within libssh that'll fail to work as well.
Mihai