QtQuick StatusIndicator disappears in a QQuickWidget which is in a TabWidget after changing Tab and back

Hi, I wrote this problem already into the QtForum and there it was suggested to report the found problem as a bug.

I created a normal widget project in QtCreator. In the main form I added a TabWidget and in the first tab I added a QQuickWidget.

Into this QQuickWidget I loaded a QML file displaying a green rectangle and a StatusIndicator (import QtQuick.Extras 1.4).

If I now start the application I can see the rectangle and the StatusIndicator in the QQuickWidget. If I now change the tab to the second and back the green rectangle is still visible, but the StatusIndicator is gone!

I tested this with Qt5.4.0 on Win7 and Qt5.5.1 on Mac.

Please help me to solve this problem.

Thank you very much

Link to Qt forum:
(https://forum.qt.io/topic/60201/referenceerror-is-not-defined-functions-tries-to-access-a-child-in-a-style-and-statusindicator-disappears-after-changing-widgettab)