When a seat logout another seat need relogin
Ubuntu 20.10
2 seat with loginctl, seat1 with nvidia card and seat0 with intel igpu. When seat1 logout while seat0 logged in, seat0 need to relogin. It looks like switch user button, seat0 does lost his session but need to relogin to access. I reported this issue to systemd https://github.com/systemd/systemd/issues/18533 here.
Edited by Bapi Dey