Don’t see the baking AABB but that does not look like your baking AABB was setup correctly, else there shouldn’t be any navmesh overlap visible to the left and right of your Conn_Woods-MVillage navmesh.
The official Godot demo repo has a new 3D navmesh chunks demo that shows how to slice large world geometry input into chunks. godot-demo-projects/3d/navigation_mesh_chunks at master · godotengine/godot-demo-projects · GitHub