When installing the GRUB version above, I got symbol grub_is_shim_lock_enabled not found and can't boot, so I downgraded back to grub-2:2.06.r566.g857af0e17-1-x86_64. I tried --disable-shim-lock but it didn't help. I don't secure boot and don't use TPM.
Package was pushed just 5 hours ago, anyone by chance ran into the same problem?
EDIT:
Tried again today, worked. Problem was likely caused because I installed GRUB into the "arch" NVRAM entry (esp/EFI/arch) instead of the Fallback which my board only supports (esp/EFI/BOOT). To do this add --removable to grub-install. The full procedure is:
# grub-install --removable /dev/sdX ## or /dev/nvme0nX
# grub-mkconfig -o /boot/grub/grub.cfg