Release notes for 3.11.0 say fixed in client view “When sharing a high-resolution screen on Safari 14.7.1, the other end receives a black screen.” - however this issue is still broken for component view.
If a user turns on a camera in safari first, the other users screen shows as black. I have attached the javascript error below for when this happens. If the safari camera is turned off and the other camera is turned back on it works as normal and does not display the black screen.