I multiboot Linux distributions. My default distribution is Fedora 32 and from the Fedora 32 menuj, I can boot:
SUSE Leap 15.2
Endeavouros (May version)
Once every two days, I change the power-on default to one of the others in the list.
If anyone of the non Endeavour systems ss the power on default, that active grub menu from that distribution is unable to launch Endeavouros’s primary grub menu entry. I have to reboot and use the Endeovouros recovery entry (lst in the list ).
By the way, excluding endeavoros, any default Linux can, without issues, boot any one, including my only other arch based linux (arclinux).
If Endeavoros is the power-on default, it can and will boot it’s very first entry. It can also be used to boot any other distro.
I use SUSE’s Linux 15.2 for c code writing as the compiler and accessories produce the same functional code as an arch linux, but the Suse advantage is “executables” from SUSE compiles are several hundred bytes smaller, indicating excellent great c code/strip functionality.
I do very much like Endeavour OS. My alternate rotation of distros is done for testing that code for one platform runs ok on the others. I test directly and not via a VM.