Dashboard sets user status randomly

On one one of my instances (Nextcloud Hub 9 (30.0.6) natively on an up-to-date Debian server) there is a small problem which has been bothering me for quite a while.
For users who use the dashboard the “status” is sometimes randomly changed. I just tested this today with my own user fron noon till evening by logging into the webinterface a couple of times: even though i never actively set any status it was changed to different values sometimes (but not always).
Just now it said “in a meeting” even though i never set it.
It’s really not a big thing (just slightly annoying) and everything else runs well, but it’s been going on for some versions (i think at least since 29).

Any ideas? (nextcloud.log is void of any entries regarding this.)