That left my system unbootable - luckyli, with a manjaro iso and “detect efi booloaders” i can boot again.
Strangely, the one that works is /boot/efi/efi/manjaro…
Now on to troubleshooting ^^
Edit:
sudo grub-install --target=x86_64-efi --efi-directory=/boot/ --bootloader-id=manjaro --recheck
works for me - notice the efi-directory is only /boot/, not /boot/efi as in the wiki
did the new grub change something in that regard?