For reference: I have been using kernel-desktop-5.19.x (5.19.2 now) for about a week on 2 computers. I also multi-boot but all systems are different versions of OMLx.
OK thanks. Before opening a bug report I will try to understand what the problem is related to. The important thing is that it is not from Oma, and as you confirm me on a clean installation it works well.
I don’t know enough to say it is not OM. I can only say I don’t have a problem on my hardware or in VBox.
One problem I recall seeing with multi-boot users is having more than one /boot/efi partition and the system is using the wrong one. I only have one /boot/efi.
Edit: The files that go in /boot/efi/EFI are typically about 4.0 KB. You could have a lot of those in one 300 MB /boot/efi partition.