Same problem here, 7900X on a Crosshair VIII Hero. Only thing I can think of that I did since this problem started is, I enabled ASUS's "Enhancement" and "Medium Load Boostit" settings in PBO, but even if I turn those back off or reset CMOS completely, nothing changes.
CPU + CPU Package Temps seem to be the only issues I'm having. My 4090 temp works fine.