ProMods

All new game versions updates profiles when you try use them or use mod manager, in this case to 1.27 and roll back resets map exploration. Safety copy your profiles folder alway before doing big changes and do it regularily anyway!

Yes that's what I figured. And thanks for the reminder. I do back up the profiles, but figured they were tied to the new version...

If you do backups before doing anything big , you can delete your profiles folder and restore it from backup, then all is normal again.