This is regarding the screenshare flag of video-content-type rtp header extension (https://webrtc.googlesource.com/src/+/refs/heads/main/docs/native-code/rtp-hdrext/video-content-type). In my tests, when enabling video-content-type in the SDP, the header presents on the packets, but its screenshare flag always has value 0, which is expected to be 1 for screenshare video stream.
<rdar://problem/85744953>