Actually it has already been reported in the support site feedback (I added to it when you advised me to do so). 
So far, can’t say if it has been taken in account or not. It’s understandable that it’s a low priority issue though.
However, the mismatched portrait lists were fixed only a couple of days after I mentioned the bug in the 5.0.4 announcement thread ; but it was regarding the profiles websites, so it’s possible the team that posted the thread was also the one in charge of that particular issue.
Actually I had a forum issue (couldn’t log-in into any of the forums) fixed in about 4 days by opening a support ticket. It took three days of exchanges to explore the existent troubleshooting possibility and convince them it was a bug. And then one of the support agents concluded it was a greater issue, transmitted it to the adequate team… and 24H later it was fixed. 
The fix was a purely forum one, and way quicker than I expected. That’s why I consider it wouldn’t be fair from me to open another ticket about the stalled avatars right now, as I’ve just benefited from their diligent help. But considering I could get to dialogue efficiently with the support team, I might be tempted to try again in a few months. 
If you haven’t closed your ticket yet, you could mention to them that the issue has already been reported, and partly explored in that topic (it’s the second bug, the first one has been solved). It may trigger a different answer from them, and if they decide to take upon themselves to transmit the issue to the adequate team, it means it may be fixed rather quickly.
Ah, so