Crash after dragging Qt Quick item on Windows desktop touchscreen

After dragging a QML item via a desktop touchscreen, the next time you touch the screen the app crashes.

Steps to reproduce:

1. Use the attached Qt Creator project, with the "Desktop Qt 5.12.0 MSVC2017 64bit" kit. This project is just the "Qt Quick Empty Project" project template, with no modifications except for inserting this in main.qml:

       Rectangle {
           width: 20
           height: 20
           color: "#ff0000"
   
           Drag.active: mouseArea.drag.active
           Drag.dragType: Drag.Automatic
   
           MouseArea {
               id: mouseArea
               anchors.fill: parent
               drag.target: parent
           }
       }
   

1. Drag the red square a few times with your finger.

Result:

Access violation on 0x0000000000000084.