Please, stop your storagenode and change the owner of the disk to the SYSTEM, remove “CREATOR-OWNER” group from the permissions list and apply changes recursively. Then add a SYSTEM user with a full rights to the disk, apply changes recursively.
After the change is made - start the storagenode and check your logs.
@Alexey I see one additional issue that is also worth fixing. By now all storage nodes should run v1.12.3. This means the storage node updater failed here. Most likely because the updater was unable to store the new version and after fixing the write permissions the updater will kick in. However the updater could also stopped running for what ever reason. I think it is worth to check that next after this first issue has been solved.