i am developing a VR Game for oculus quest in unity 2019.2.15f1. To save computational power i started to move from realtime lighting to mixed lighting. If i build the game with realtime lighting or baked lighting or mixed lighting (subtractive) all works fine. If i change to shadowmask, i can bake and build without problems but when i start the game on the quest, i see the "made with unity" screen and a few moments later i just see a grey (or black) screen. But i can hear the game music. I am quite desperate and any help would be much appreciated. I never build a game for the oculus, please help. Let me know if you need more information.