[2D][Tilemaps] Filter Tilemaps when using Tilemap Focus does not work in Prefab mode

Repro Steps:
1. Create a new 2d project, in the new scene create new tilemap
2. Create a second tilemap "Tilemap (1)" on the same Grid game object
3. Open the tile palette and use the tilemap focus on tilemap tool in scene
4. Paint on both "Tilemap" and "Tilemap (1)", notice the filtering greyout works as intended
5. Now make Grid game object a prefab and repeat step 4
6. Note that Filter Tilemaps when using Tilemap Focus does not work in Prefab mode