SetIsRequestingUnloadAndRemoval causes OnLevelUnloaded callback not to fire

When unloading a level via ULevelStreamingDynamic, if you register a callback for OnLevelUnloaded and then unload the level with SetIsRequestingUnloadAndRemoval, the level appears to be removed from the world's level streaming list before we broadcast the state change. This can be worked around with a two-stage process (use SetShouldBeLoaded(false) and then do the SetIsRequestingUnloadAndRemoval in the OnLevelUnloaded callback) but there's no way to get a callback after the removal in that case.

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