This is semi-bug in suse-module-tools and/or sdbootutil. They attempt to use sdbootutil even though the system is setup to use grub2-efi. Most likely you tried to use systemd-boot in the past or did something that caused it to be present on ESP.
I do not have this either, which makes me really wonder what you did … OK, it is installed by sdbootutil when it sees grub2 instead of systemd-boot.
Anyway - the immediate fix is to delete the file /boot/efi/EFI/opensuse/installed_by_sdbootutil. It should stop attempt to use sdbootutil. Of course, you can simply remove sdbootutil package entirely.
Before doing it, open bug report on https://bugzilla.opensuse.org/ (same user/password as here), select Bootloader as component. Include the complete zypper output you posted earlier, the output of ls -lR /boot/efi and the output of grep LOADER_TYPE /etc/sysconfig/bootloader. Post link to this bug report here.
Well, you can remove any subdirectory of /.snapshots for which no corresponding snapshot is shown by snapper.
P.S. for the future, always force command output to (default) English with
LANG=C ls -l
or similar. In this case the actual dates are not that important, in other cases they may be.