To Reproduce:

1. Open the attached project and build for Apple TV (only include '3dTest copy' scene).
2. Observe that the app gets stuck on a white screen when running on an Apple TV in:

#2 0x00000001009e8d80 in ::Sleep() at /Users/builduser/buildslave/unity/build/Runtime/Threads/ThreadHelper.cpp:61
#3 0x00000001009a4b44 in ::WaitForAllAsyncOperationsToComplete() at /Users/builduser/buildslave/unity/build/Runtime/PreloadManager/PreloadManager.cpp:551
#4 0x00000001008a8184 in ::LoadScene() at /Users/builduser/buildslave/unity/build/Runtime/SceneManager/SceneManager.cpp:73
#5 0x0000000100956778 in ::PlayerStartFirstScene() at /Users/builduser/buildslave/unity/build/Runtime/Misc/Player.cpp:633
#6 0x0000000100b06900 in UnityLoadApplication at /Users/builduser/buildslave/unity/build/PlatformDependent/iPhonePlayer/LibEntryPoint.mm:238

The issue is very strange and can only be reproduced, on scenes that have been imported from an older version of unity and have a gameobject with the 'TestManager.cs' script attached (this gameobject can be disabled) (!), but the same scene loads perfectly fine if the gameobject ir removed.

Also adding the same script to a new scene also doesen't reproduce this (the scene is loaded fine and the script works as expected), so this might be some issue with serialization.