Steamdeck screenshare in gaming mode is black screen

Summary

My friend tried screensharing on steamdeck, it works on desktop mode but not the steamos gaming mode, all i see is a black screen in the gaming mode when he tries to screenshare. I know Discord was able to get the capture working in gaming mode recently, i dont know how they did it exactly but the discord video developer i was talking to said it was different to get it working correctly.

Steps to reproduce

1. Have a steamdeck
2. Add Fluxer as a non-steam game
3. Launch Fluxer in the steamos gaming mode
4. Screenshare
5. Notice the black screen on the screenshare

Environment (optional)

Cant provide it yet.

Logs or screenshots (optional)

Cant provide one yet, will have to ask.