NavMeshSurface still exists even after removing it

Hello.

Since yesterday I have had some strange experiences with the NavMesh system and Terrain.
Somehow a cached version of a nonexistent navmesh still exists in my scene and completely breaks the way pathfinding is supposed to work.
I have tried removing the Terrain, creating a new one, readding all components related to the navigation system, closing/reopening the editor, using a different agent, using a different terrain, everything that came to mind, yet, the fake NavMesh still exists, somehow.
Attaching some screenshots.

On the first picture I have removed the actual NavMesh component, and only the "fake" one exists, which is completely unrelated to the texture of the current terrain.

On the second picture I have enabled it, resulting in two different NavMeshes on the same terrain, the real and the fake one.

Any clue what might be causing it/how to remove the fake navmesh? Thanks in advance!