Seems to be working for me with Findroid 0.15.3 on jellyfin server 10.11.1, did a clean install just for this test, just also tested downloading and offline play pay, that also seemed to work.

If the app was still installed and logged in when upgrading to latest major version of jellyfin server, the other poster might have to clean cache on the app. I had to do this for all my current jellyfin android app sessions, otherwise it wouldn't connect to the new jellyfin instance after I upgraded.

1st pic my findroid version installed, 2nd pic my jellyfin server version, 3rd pic streaming from findroid.