It may be that the OS was installed in manual partitioning and /boot is within a btrfs file system. Grub does not like that and can only be done with careful config.
When installing using the automatic partitioning the system creates a /boot partition as ext4, a /boot/efi partition as the ESP (fat32) partition, and then uses btrfs for the root and home subvolumes.
The only time I have seen that error is when /boot is contained within the btrfs file system.
can I change from btrfs to ext4 without reinstalling the distro?
(Note that the distribution is working, but after running it shows me an error in the problem reporting program)
that is likely unrelated to the grub error message. I would ignore it for now if your system is working fine otherwise.