My plex home users are missing after accepting invite from another user, help

I have a plex pass and a plex home with a few users, both managed and plex-account owners, and today person with another server and no plex pass shared me his library. I saw a notification and clicked green check-mark next to him, thinking that I’ll just see his server/libraries in my list. But now when I press Switch users - I see just me and him, and the crown icon is on him instead of me, and all my other home users are gone. Is it what supposed to happen? I thought that even if I mistakenly added him to my home instead friends, he won’t overtake my home and will just be another user, but that’s surely not what’s going on.

Will appreciate any help, thank you.

UPD: I left that home (so it’s possible to join home of non’plexpass user server? that’s weird), an now my home is empty. Can I get my old home back? I can re-invite plex users there, but what about managed users? Can I restore them or are they gome forever with their progress?

No, as soon as you join another user's home, your own Home is deleted.
This is spelled out in the warning dialog you were presented with.