Hi too, but you should have gone with your initial thought – the general rule is: one topic per issue from the same member, irrespective of perceived similarity to another member issue.
Your posts have been moved to a dedicated topic. 
Refind refers to it as an efi stub loader, one of several on your $esp, for example bootx64.efi, grubx64.efi, and others depending on the OS used – these are not “present in the Linux kernel” at all; in fact, they act as an intermediary; a stepping-stone; to the Linux kernel.
One stub will launch the kernel directly and the other will launch GRUB.
Presuming the UUID and kernel reference is correct, this seems OK. Is refind not detecting boot loaders automatically, without the manual stanza?
Is 6.12 (LTS) still installed?
Is the 6.12 (LTS) kernel still selected for use by Refind? You might wish to check refind_linux.conf to make sure. If it isn’t, manjaro-refind-installer is a handy tool to re-select the kernel you prefer Refind to target.
sudo pacman -S manjaro-refind-installer
I had an issue after the recent Stable update, when Refind was updated to v0.14.2-2; while this may seem different at face value, maybe it’s related:
It turns out there was a problem with that release, which was subsequently mentioned (see below); my workaround was to revert to v0.14.2-1 as I describe in the previous quote.
I hope some of this may be hepful.
Regards.