The patched version works flawlessly for me! (ge-proton10-32-qcap-dshow-fixes)
I’m on LMDE 7, Kernel 6.12.74+deb13+1-amd64, with a Lenovo USB Webcam.
I don’t seem to have the issue of it breaking when switching instances. It correctly deinitializes and reinitializes after join.
That’s great work! 
@LilFishyChan
I’ve been waiting for some updates on this for ages :))