PinchHandler works only with 3 points when used in Page of StackView

I want to use PinchHandler to control zoom and orientation of a map.

this usage is show in minimal_map example and it works fine with 2 points (fingers)

This code copied inside Page of a StackView requires 3 points to became active. (Please find attached the updated main.qml of the example to show the issue)

If I replace Page by Item, it works again with 2 points.