Yes Manjaro/Arch does not always play nice with other distros’, (and this has been going on now for a few YEARS !?).
However, some quick knowledge of “efibootmgr” for multibooting, within uefi, on a single/multi drive, can go a long way. Or, you end up fiddling around with GRUB(uefi), after the fact too, although that can be also more intense, and cumbersome, aka that silly 'intel-ucode" panic conundrum, … ?!
And “os-prober”?, -now theres another weird mess, tied to above, from grub/manjaro, becuase of the fact.
Bottom-line is: (as mentioned countless times before), Manjaro still prefers it’s own (grub)boot-loader control, (hopefully you installed Manjaro last), within your Multi-OS-installation explorations, otherwise, … ?
Anyway, that’s another pain-in-the-butt, one of many, that manjaro NEEDS to fix/deal with, if it can ?
and if anyone mixes uefi and mbr?,then they’re on their own in all cases./