qtwayland does not support fullscreen

I used the wayland example pure-qml.

When I start a QML application with -platform wayland, and show the main page with showFullScreen(). the application is not fullscreen, and the console print a error message :

"qt.qpa.wayland: Wayland does not support QWindow::requestActivate()"

Is it a limit of Qt? 

When the client is started, the compositor print this:

Can't configure xdg_toplevel with an invalid size QSize(-1, -1)