I dont get it... I've tried multiple of the old kernels now (going back to linux-rpi-5.15.68-2) and it still have the same problem. I KNOW that it worked just a couple of days ago so perhaps the kernel is just a red herring.
You could use ALA to test this... setup your mirrorlist to point to the date that reflects the packages that you knew to be working. Then run pacman -Syyuu to force the downgrade.