Can confirm the Fuma 2 / b450 strix / TG panel combination does work together with no modifications. Just. Like micromillimeters just.
In saying that, on my build only 1 of the heatpipes prevents a piece of paper being slid between the glass and cooler, but it has been crimped really crappily at the end so I could try risking filing off a tiny bit (like 0.1mm tiny).
Doesn't seem to be stopping the panel from fitting perfectly, though. And I don't think the heat from that 1 tiny contact area would cause any damage (please correct me if I'm wrong).
I also had a look at the backside of the MB and definitely have room to play around with the stand off length if I wanted (bearing in mind I/O plate alignment as stated by previous post).