No sound when streaming games in iOS 11.0.3 (iPhone 8 Plus). Does everyone have it?

Question

iPhone

Used Omlet, Youtube, Mobcrush. The first one did not stream at all and there was no video after the end. Youtube writes, but there is no sound, and only once it leaked, when I also chose to broadcast through the camera (but I do not want to be seen), and Mobcrush always writes without sound. Games used with ReplayKit support. I can't understand what kind of bug is this? Is it in the OS or something. I'm confused:)