Yet another input bug on Android, if you are to touch over one mouse area and move the finger to another mouse area and release, the second mouse area's containsMouse will be stuck to true until another mouse area is touched:

  Column {
    spacing: 2
    Repeater {
      model: 5
      delegate: MouseArea {
        width: 200
        height: 100
        Rectangle {
          anchors.fill: parent
          color: parent.containsMouse ? "red" : "blue"
        }
      }
    }
  }

Much like rapidly clicking two mouse areas rapidly results in a bogus double click in the second, this issue too appears to be a product of poor platform support implementation.