Qt Wayland compositor broken on raspberrypi4-64

Unfortunately, buffer sharing between compositor and clients doesn't work with wayland-egl on raspberrypi4-64. Sharing via dmabuf (linux-dmabuf-unstable-v1.xml) does work, though. The problem is that the necessary plugin isn't built in the Yocto recipe. We'd need something like:

--- a/recipes-qt/qt6/qtwayland_git.bb
+++ b/recipes-qt/qt6/qtwayland_git.bb
@@ -24,6 +24,8 @@ PACKAGECONFIG ?= "\
     wayland-client \
     wayland-server \
 "
+PACKAGECONFIG:append:raspberrypi4-64 = " dmabuf-client-buffer"
+
 PACKAGECONFIG:class-native ?= ""
 PACKAGECONFIG:class-nativesdk ?= "" 

or how ever this is properly done in Yocto.

Actually, sharing via dmabuf could be enabled on any platform that supports it (not only raspberrypi4-64). Wayland compositor support for dmabuf will have to be enabled anyways by setting:

QT_WAYLAND_CLIENT_BUFFER_INTEGRATION=linux-dmabuf-unstable-v1 

I can't tell, whether raspberrypi4 (32bit) has the same issue or not.