Before I get into the bug I’d like to mention that actually reporting this at all is an absolute nightmare. If I “contact support” in game (as it asks me to do) and then go to “Report a bug” it either redirects me in a circular fashion back to advice on how to report a bug in game, or it redirects me to the US forums where I can’t post.
As for the bug itself, I’m not sure how it’s going to be possible to replicate, but at 03:25am server time I got into a 2v2 match in the Ruins of Lordaeron, during the course of the match both myself and my partner at the same moment were unable to use abilities. We could both still move, but neither of us could activate any ability. The enemy team had no problem activating abilities, it was definitely not latency. It only occurred for the one arena, and hasn’t happened since.
After the match ended, we were both unable to leave the arena. Both by the standard button, and even by right clicking the minimap button. Alt F4 didn’t help either, we both zoned back into the arena and were unable to leave until it closed itself.
Edit: I should note, this is on TBC classic. Either I’m blind or there isn’t a TBC specific tech support forum so, I’m out of options because of the frankly awful design on how to report bugs at all.