No, what I'm referring to is indeed locations not being marked as "visited" or discovered, as in locations I'd already been to couldn't be fast-traveled to, and no text ever popped that I'd found it. But, you're right in that the fix was for to the compass for not showing points of interest, which serendipitously had the side-effect of fixing the issue in the OP. I'd decided to try it on a whim. For whatever reason, re-adding the small, unfilled triangles to the compass enabled me to "discover" locations on the world map, which is what the tweak did.