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FDefaultGameMoviePlayer::Tick() calls FAsyncLoadingSplash::GetSplash(), but FDefaultGameMoviePlayer extends from FTickableObjectRenderThread, and FAsyncLoadingSplash::GetSplash() has check(IsInGameThread()); in it and asserts.
Furthermore, without modifications the code in FDefaultGameMoviePlayer never successfully shows the splash screen, because IStereoLayers::bSplashIsShown is never set to true, and bSplashShowMovie is never set to true. Only once you resolve those two issues (perhaps by adding bSplashShowMovie = true; to the top of IStereoLayers::SetSplashScreenMovie() and adding a call to StereoLayers->ShowSplashScreen(); before the call to StereoLayers->SetSplashScreenMovie in FDefaultGameMoviePlayer::TickStreamer) does it even make it to FAsyncLoadingSplash::GetSplash().
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