Booting agl-ivi-demo-platform-html5 on raspberrypi4-64 fails to show the desktop:

• Sometimes we see a hang on launch, that is caused by a wayland roundtrip not finishing. This shows homescreen and a black area where launcher is expected to be, but as it is hung, no interaction is possible.
• Sometimes we see homescreen for a moment and it goes away, and launcher is not visible nor showing its first frame.

This could be related to the recent changes in agl-compositor explained at SPEC-4603, but I could not confirm it.