Horizon and Passthrough at Quest 2

Since the last update does not work passthrough. From the start on, which has a grey screen and need tap two times the on/off to see not only dark grey, there is horizon ambient. If I choose Passthrough it appears a small window which say, that I can go every time back to horizon ambiental. If I close this window appear again horizon, if I only use the occulus button to go to menue, as well I am back in horizon. I really like to navigate through menue in Passthrough, but it is not possible since the last update. I have a Quest 2