I just started a new battlegrounds game straight after ending my previous one (where there were no problems), picked Yogg after looking at the available options for maybe 4 seconds, and then it went wrong.
Immediately after I picked Yogg it showed all my ‘opponents’ as being the Medivh mage hero portrait, without names, and then showed me the following screen:
https://imgur.com/a/xW3A1iL
Yogg is now a ‘card’ which can’t be played, and the rest of the game doesn’t load. It’s still like this even now, after waiting about 5 minutes.
I’m not sure what exactly caused this, but something clearly went wrong.
Edit: I tried restarting the game and it apparently treats it as an 8th place loss, since my rating is now roughly 120 lower.
Edit 2: It happened again, same exact situation as mentioned above, except this time with A. F. Kay. I restarted the game and it loaded me in as normal, but I’d missed my first turn at that point.
https://imgur.com/a/K67Lnkl