@simran Uff, interesting!
First of all: zero-copy playback is a #Wayland only feature - in fact it's one of the things that originally motivated its creation in the first place as it's not feasible on #X11 desktops.
Secondly: If your driver is blocklisted for Wayland, then I wouldn't expect anything to work, especially no advanced features.
That being said, it would be interesting if the issue you are seeing is actually even related to zero-copy playback - or if this is regular gl.