X670E PG Lightining stuck on boot when restarting

So, I got back a new motherboard after a month, the store had to send me one since from ASRock there was no response after 30 days.

I reinstalled everything and the first thing I do is restart the system to see if I still have the issue...and it still happens.
So the only thing that could be is the RAM kit, even though it is listed on the Memory QVL and it's stable on every stability test I ran.
So I bought a new RAM kit, this time EXPO instead of XMP and it's also Hynix instead of Samsung and everything works fine. I restarted several times now with EXPO applied and the settings are always applied correctly and no more being stuck (CPU/DRAM leds stay on) after restarting either.

Just wanted to leave this here if someone else has similar issues. My theory is that my kit and most likely some other RAM kits are not compatible with these motherboards. I've seen some posts on reddit with B650 boards as well experincing the exact same issue with XMP RAM kits, so it is most likely this.
I've reported my findings on an ASRock support ticket so that this can be looked at.
Everything is fine now.