Fog of War in new areas already has some exploration

[Lolmer]

What went wrong?
When I go to a new area (never been there on this character, account, or computer (e.g. via another person sharing computers)), but some areas have already been explored.

Screenshots (via a site like imgur) or video, if applicable
https://imgur.com/a/PG3TYBc

Related links:

• Fog of war not working properly

Thanks!