Recently I upgraded our android Zoom video sdk to the latest 2.1.5 and whenever user A turn off the camera and turn on back then black screen for the User B for User A video.
This issue is not there for Zoom video sdk 2.1.0 for android
this lib https://mvnrepository.com/artifact/us.zoom.videosdk/zoomvideosdk-core/2.1.5