WebEngine fatal error in XWayland at startup -> GLX: Failed to find frame buffer configuration.

I am using Arch Linux with the current Qt6.9.0 (and an Nvidia GPU.)

Tested in both KDE/Wayland and GNOME/Wayland.

Any WebEngine apps will crash at startup when choosing to use XWayland.

For example, falkon

> QT_QPA_PLATFORM=xcb falkon
GBM is not supported with the current configuration. Fallback to Vulkan rendering in Chromium.
Fatal: GLX: Failed to find frame buffer configuration.
fish: Job 1, 'QT_QPA_PLATFORM=xcb falkon' terminated by signal SIGABRT (Abort)

I am maintaining an app that currently requires XWayland, and we received a few reports.