EditorWindows to force refresh when base scene is unloaded

## Describe the task

This would the expected behaviour and without it, it can cause the editor window can show you stale data that is not longer ref'ed by the game.

Start by locating the Unity EditorWindows code and the scene-unload path. Inspect how editor windows retain displayed data after a base scene is unloaded, then verify that the windows refresh and no longer show stale data or references.

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