blueicetwice Well, this is the orphan_file feature that was added with Kernel 5.15 and e2fsprogs 1.47.0
Whatever distro you're checking this drive from has too old a e2fsprogs version to recognize that feature, as the error message hints. When you look at the drive from an (updated) Solus installation no such error message should appear.
See https://e2fsprogs.sourceforge.net/e2fsprogs-release.html#1.47.0
and https://askubuntu.com/questions/1497523/feature-c12-e2fsck-get-a-newer-version-of-e2fsck