@nebulon Yes, it seems like it is: https://help.nextcloud.com/t/how-to-remove-device-session-on-security-personal-menu/107430
https://help.nextcloud.com/t/disconnect-all-sessions-revoking-access-for-all-apps-of-a-user/37955/8
Waiting for an official fix, two workarounds mentioned in these topics are editing database or running a bash script. Nothing that I'm able to do, but yeah, this does need to be solved upstream.