The bug is already known and will definitely be fixed by WolverinDEV .I add group to user but when he disconnect from server he lost his group
Its like the same for me. So very thanks @WolverinDEV !Ohh sorry my fault I don't haveb_group_is_permanent
I make copy of default (server) group "Guest" and he hasb_group_is_permanent
set to no.