MUC presence from barejid triggers got_online event
It seems that MUC (available?) presence coming from roomjid triggers
got_online, which makes poezio display that in the InfoTab as a roster item. This is caused mostly by how MUC avatars are handled.
Of course filtering
got_online based on the origin being a MUC wouldn't be a good thing as nothing prevents a MUC from being added in there..
I haven't tried to reproduce myself but it's been reported by peetah in the poezio@ channel.