well some say don’t put the cryptodisk to the preload-modules line: [LVM on LUKS] GRUB error - no such cryptodisk found. It is simple:
- if your system boots and you have to press a button, well it is a nag
- if you find out how to fix it, all power to you
You can try to do several things with the /etc/default/grub file and call update-grub after. Do a reboot. Always have a USB-Stick with Manjaro on it ready to fix if you break too much. Installing grub into UEFI/MBR I always see as last resort but might fix your problem to get the warning/error away.
To clarify the issue you have to provide more info. Do you use ext4 or btrfs. Did you use the automatic partitioning of Calamares or did some manual one on your own? When did you install your system? Ask other persons who had the issue and fixed it what surroundings they have. And participate at the official discussion of the problem @Arbitrary: Can't boot LUKS encrypted install after 2023-03-31 stable update - #7 by philm