When doing a pinch via the Wayland compositor the points can suddendly flip and then back again

When doing a pinch via the Wayland compositor the points can suddendly flip and then back again.

In the example, if you start to do a pinch around the blue rectangle then you can see that it suddendly flips from one corner to the other and then back again. It might take a few goes to see it, but it happens. To reproduce in the example start it like:

QT_XCB_GL_INTEGRATION=xcb_egl ./WaylandTestCompositor -platform xcb & 
QT_WAYLAND_SHELL_INTEGRATION=ivi-shell QT_IVI_SURFACE_ID=102 ./WaylandTestClient