I have an object that handles the level tilemap, when the tilemap reloads, any RFCs that effected the previous map on it no longer apply so I liked to clear them out (so joining an in-progress game doesn't take forever if the server has been running a while). I could delete the whole tilemap and recreate it when the game loads a new one but it seems like overkill and would require me rebuilding a bunch of references to it in other parts of the game every time that happens.