Cannot login in MUC if it's already present in roster
When I get an invite to a MUC, the conference is automatically added to my roster; I cannot join the conference if I have it in my roster because the join dialog says it's not a conference name. I have to delete it from my roster and only then I can finally join.
Steps to reproduce
I use PyVK transport to vk.com, it sends invites to multi-user dialogs as MUCs.
Reproducible on Linux and Windows.