Teams mobile on Android, General channel broken?

I think I found what causes this: right before the General channel in our team got broken on mobile, we tried out a meeting/group call for the first time on that channel on the desktop client. It worked just fine, but afterwards, the mobile app could no longer open the channel contents.

So, recently we had another meeting on a different channel, and lo and behold: now that channel is broken on mobile as well. So seems that having a meeting on a channel in Teams free breaks it on the mobile client! Pretty nasty bug if you ask me... but since it's free I guess we won't be getting a fix...