[Wayland] Qt3D applications fail occasionally with overview-compositor

Using the overview-compositor example from qtwayland and launching several Qt3D applications as wayland clients.

Most of the time this works well but sometimes (in about one in ten) one of the 3D applications flutter around and then goes white.

It looks like the client has slighty wrong size or position for a short while (less than a second) before it is completely removed.

Compositor and client application is included in the attachment along with application logs with WAYLAND_DEBUG=1 enabled.

Steps to reproduce.

1. Launch the attached compositor 
2. Launch multiple instances of the attached Wayland client
3. Occasionally the Wayland application fails to show on the compositor