Well, I doubt anyone will ever find out how to fix it that isn't some miracle "works for me" cure.
I've switched to NProfiler for now. Seems simple enough.
If you ever get yours to work, @coreclr, do let me know.
I found in the chat logs that I had had the exact same problem on 15.05.2022, but I got exactly zero responses back then.
I do not know how, but I am quite sure I got it working again for a while after that.
If you don't know what the issue is, but are willing to help, you could send me a .diagsession you recorded, so I could verify if it's the recording or the displaying that's broken.
No, see, if I remove that variable, it still says I have defined stuff like NET7.0, and DEBUG or whatever the name for the profile I'm compiling is, but what else does it add?