The command isn't part of my mod (it was for like a version or two because I didn't get it in the game in time) but the actual feature was always part of the game

Also it's not meant as the big "all-time tool" but rather a band-aid for as long as we don't have that fully fixed. Proper reports of how those issues come up in the first place would be way more useful than just adding in "better" versions of such a band-aid.
Btw, you don't need to run the fix command against every coordinate, just one coord out of a chunk is enough (e.g. the coord used when running the check).