I also have that issue with group chats not opening. Not only that, but i cant see the member names on list 99% of the time, its just empty.
BTW i noticed another issue(not new): if you add a contact all goes well, but if someone asks for your auth, it will not have a phone number attached, meaning it will never receive your messages(afaik). To make things worse, if a second person asks for your auth, it will overwrite the first(numberless) one. Meaning you basically have a placeholder that gets overwritten at every request you receive.