I'm having HDR crashes as well, however im not undervolted at all. Been happening since i got the dell AW3423DW, all drivers from 22.5.1 to latest 22.9.1. Even upon crash sometimes the AMD drivers would uninstall themselves and i have to reinstall.
You gave me a good idea though to try slightly increasing the voltage as perhaps that is what causing the crashes.
You're not alone though, HDR with AMD GPU lately has been very spotty for me.