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This occurs in both GNOME40 and 3.38, and happened after login too, but after-login can be turned off in housekeeping.
This does not occur in SDDM or LightDM.
I don't know how to turn the warning off, as this is non-sense.
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Yes.
It's the partition created by Windows, very small, before I install GRUB into it.
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You could avoid this properly by generating your kernel images into your root partition and only keep GRUB on /boot (... or rather the ESP). To do that I'd unmount /boot, remount the ESP to something like /efi or so and copy over the initramfs and vmlinuz images and the grub folder to /boot (which should now be the directory and not the ESP) and then reinstalling/regenerating GRUBs config.
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