After switching branches from stable to testing and updating the system, I was met with the Error: symbol 'grub_memcpy' not found during boot. I fixed it by chrooting to the system from a live usb and then
cd /boot
cp grub/x86_64-efi/core.efi efi/EFI/BOOT/BOOTX64.EFI
Running install-grub from chroot didn’t fix the issue. Also, this only happened on a laptop installed with the Manjaro Cinnamon ISO (manjaro-cinnamon-25.0.3-250609-linux612.iso). Two other laptops installed with Manjaro GNOME ISO (manjaro-gnome-25.0.10-251013-linux612.iso) didn’t exhibit this issue after switching.