BusyIndicator leaks memory in 5.9.4

import QtQuick 2.9
import QtQuick.Controls 2.2

ApplicationWindow {
  id: mainApp
  visible: true
  width: 800
  height: 600
  title: qsTr("Hello World")

  property int loadCounter : 0

  Timer {
    id: beat
    repeat: false
    interval: 1
    onTriggered: {
      loadBtn.clicked();
    }
  }

  Component {
    id: comp
    BusyIndicator {
      Component.onCompleted: {
        beat.restart()
      }
      Component.onDestruction: {
        beat.restart()
      }
    }
  }

  Loader {
    id: loader
    anchors.top: parent.top
    anchors.right: parent.right
    width: 400
    height: 400
  }

  Button {
    id: loadBtn
    text: "load"
    onClicked: {
      loadCounter++;
      var r = loadCounter % 2;

      if (r === 1) {
        loader.sourceComponent = comp;
      }
      else if (r === 0) {
        loader.sourceComponent = undefined;
      }
    }
  }
}