Touches cancelled when interacting with multiple windows

I have an application where I use multiple windows. It is a music making application and I have a piano keyboard, and the instrument being shown on another window. I really need to use a Window instead of any other QuickItem because I can host external AUv3 and they need to get properly embedded in the UI.

When users are playing the keyboard and then try to change a parameter in the engine window, the key gets stuck. I believe this happens because the touch areas live in different windows, and the first one loses focus.

I have attached an example where I demonstrate this problem. I have two sets of row layouts with rectangle that react to touch. If you touch on a rectangle on the red zone, keep the finger pressed, and then touch on a rectangle on the green zone, if you lift the finger on the red zone, it will keep white (stuck).

I have used MouseArea for sake of simplicity but the problem happens with MultiPointTouchArea too.