remounting boot partitions errors (vfat)

manually unmounting and re-mounting /boot/efi
generates dirty bit errors:
Quote:

fsck.vfat -n /dev/sda1 fsck.fat 4.2 (2021-01-31) There are differences between boot sector and its backup. This is mostly harmless. Differences: (offset: original/backup) 65:01/00 Not automatically fixing this. Dirty bit is set. Fs was not properly unmounted and some data may be corrupt. Automatically removing dirty bit. *** Filesystem was changed *** Writing changes. /dev/sda1: 14 files, 11815/166068 clusters

example from VM, but the same behavior in the host on nvme

I don't have /boot/efi entry in fstab as it is not needed for boot, however each time I install a new kernel, I need to mount /boot/efi
and then I see dirty bit error.
This is pretty old story but I could not find any solution.

Anyone know how to fix this?

Thank you.