Here's how to fix it before mesa developers implement the fix themselves:
https://forums.playdeadlock.com/threads/invisible-players-bot-models-dx-vulcan-on-linux-intel-arc.7419/post-52070
I fixed the issue for myself and described how to do it here:
https://forums.playdeadlock.com/threads/invisible-players-bot-models-dx-vulcan-on-linux-intel-arc.7419/post-52070
At this point, there was no action for more than a week, so i decided to fix the issue myself.
Note that I'm using arch, so some package names can differ depending on your distro.
Open the console and clone into the mesa repository using git (install git if you don't have it):
git clone...
It seems that the merge request is submitted, but it needs "manual action". Is there an option to somehow persuade people in charge to take a look at the merge request?