Go home! Arena, you're drunk. Possible GAME-BREAKING Arena bug!

https://gyazo.com/b0821b572a7c2acf5297bbc2becdfe2a

Hello, today I was 2-2 in a warlock arena run when I came across druid that had a wild deck. Now I know that's not unheard of but that's not why I'm posting. I'm posting because of what happened AFTER that game.

I lost that game and, to my surprise, the "Play" button was still lit up on the arena screen. But, there was no key or anything where the key usually shows up. I spam clicked the play button and queued up for another game... while still having THREE losses!

I played the next game and won, but afterwards I was greeted by the ending screen for arena and a key with 2 wins, despite having won 3 games in total.

I have no idea what caused this bug, but I can't help but feel bad that I basically ended some poor guy's run while not gaining a win for myself.