Posting how i fixed this just in case someone else runs into this.
So I still never figured out what exactly the issue was but I ended up backing up binhex-plexpass using the old Backup/Restore Appdata plugin again. Then reformatted plex_appdata as xfs, then again back to zfs (I tried zfs first but it didnt fix the issue, so i had to do xfs first then zfs again). Once I did that I restored from the Backup/Restore Appdata plugin and the ran the spaceinvaderone script and it did a proper full snapshot... what a headache with no clear reason why.
