well, user mentioned wayland .. may be Xwayland (+ nvidia)  does not report some opengl limits correctly? Historically GL was highly linked to X server, I bet move to wayland might broke less common cases like pbuffers we use  ... If warning will prove to be important I guess there will be two ways to avoid it :  move back to X session (and report bug to freedesktop) or just report bug to very same body and do not use opengl .....