Warning when showing a QWindow after hiding it in a Wayland environment

We are getting the following reproducible warning within a QtWayland environment when showing a QWindow that was previously shown and then hidden:

Unexpected wl_surface.enter received for output with id: 12 screen name: "Screen7" screen model: ""

The attached example (WindowTest.zip) demonstrates the issue. It must be run with -platform wayland as argument. The issue can be reproduced by using either the official QtWayland example qwindow-compositor or Weston. For this, the green rectangle must be clicked. Then, in the opening window the blue rectangle must be clicked. After clicking on the green rectangle again the warning is outputted.

I attached the output when executing the application with WAYLAND_DEBUG=1 (client.trace).