The xwayland flickering has also been happening here(with xorgproto, wayland-protocols and xorg-xwayland patched with explicit sync) on 545, which doesn’t happen on 535.
Please find a video attached which shows the issue(it is on Gamescope on X11 session, the issue happens only with xwayland apps, hypnotix comes to mind which uses xwayland on wayland also triggers this same flicker). Video_2023-12-23_10-39-46.zip (40.6 MB)