ReCast FF3: War of the Magitek

Looking at Lockirby's screenshot, that grass square seems like it is meant to appear between the Sabil rapids of the Lete river and the isolated triangle island in the northeast corner of the world. When I open the ROM in FF3LE CE, though, there's nothing but water there.

I'm inclined to believe these are compression artefacts. Unfortunately that means I don't have any way to fix them, because I don't understand the compression algorithms and the only way I was able to edit the maps at all was with the editors.