Hello there, and welcome to the forums!
I’m sorry to hear about your experience. The “black circle overflow” bug has in fact been noted for a while, though it’s had different causes - many of which have been fixed. This is something I myself actually encountered and reported back before joining the team here! That specific case, with my feedback, was able to be identified and fixed, though as mentioned there is still a way to cause it.
We do get infrequent reports about this issue, however we’ve not been able to reproduce it internally, nor have any reports been able to find a way to reliably reproduce the issue (or at least reported a reproduction case) for us to reliably investigate.
All bugs are bugs we want to fix, however we also need to prioritize bugs. With this one in particular, it’s a bug which is rare to happen, and doesn’t currently have a known reproduction. This means to address it, we would need to pull apart any and all related code to try to ide...