Were you able to move on from the interim fix with "safe graphics" btw?

I'm stopping by only at this time cause I came in from your "get better at [arch]" post.

Have you checked if your BIOS has some proprietary stuff that restricts it to use only particular hardware? If nah, ignore me, my bad.
Not the same situation but similar - I bought a former school desktop pc & had blank display issues. The pc wouldn't accept using a different hdmi cable other than the first one I'd ever booted it up with - and even then, it would hang on the mobo logo. No one said turning off secure boot was a fix, but suggested it often enough that I checked the bios anyway. Lo and behold, there were multiple proprietary "security" features (not secure boot) in the bios that only allowed the pc to connect to approved devices or networks. Makes sense for a school/business. I didn't care to find out how to whitelist "approved devices", so I just turned off all the BIOS's fancy security features.

Try switching to X11, see if the issue persists.

Also which screen size options does your monitor see? In my experience it could act problematic with high refresh rate 4K displays, try reducing them until it feels fine.

My bet is it tries to default to mode that your display doesn’t like, probably because of some wrong info in monitor’s EDID downloaded from the connector, but that’s just my guess.

Before booting, use key e on grub menu, locate line where there is initrd to pass boot parameters. You can force modes using video= parameter, and you can also replace/modify your EDID. Refer to section # Forcing modes and EDID on this page: https://wiki.archlinux.org/title/Kernel_mode_setting

These changes can also be achieved permanently by editing /etc/default/grub and regenerating its configuration, in case you use grub.

Easiest would be to have separate extra monitor temporarily or another computer to connect over SSH, but if those low “safe” graphics modes work, that can probably do also.

Do you see any errors/failures/timeouts/etc in the logs when you use journalctl?

Please post your full specs first.

Does your system have two graphics processors? One of my laptops won't work with many distros as they boot to blank screens after install. Fedora was one that does work in my case.

It's a laptop with two GPUs.

After booting in, switch to a tty, then start the de from there, so like I use plasma so I execute plasma-wayland. Check if that works, if so, then the problem lies with the login manager (sddm or gdm). If not post the error log and I will check if I can understand what's wrong.

sounds like a secure boot issue.