Windows 11 booting causes weird (non-critical) grub errors

Probably starting with some update for Windows 11 1-2 month ago, my dual-boot setup has been showing some weird behavior (having worked flawlessly before that). After I boot Windows 11, starting up GRUB shows the following weird errors:

Failed to open \EFI\UBUNTU\... - Invalid Parameter
Failed to load image \EFI\UBUNTU\... - Invalid Parameter
start_image() returned Invalid Parameter, falling back to default

GRUB errors

It still functions and boots both systems as expected (the only notable difference, apart from the aforementioned errors, is usage of low-resolution (80x40?) text mode for GRUB instead of default high-resolution one).

The problem can be fixed by running grub-install in Ubuntu but it comes back after I boot Windows next time (booting Ubuntu doesn't cause this issue). This behavior has been observed with both Ubuntu 20.04 and Ubuntu 22.04. Having suspected EFI directory corruption, I checked /boot/efi during the issue and after the "fix" and it shows no changes, so it might be something else.

I'm curious if anyone else observed this and knows how to fix it.

3 Reset to default

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