When using a custom Window container with forwarded default property and a Text item in the contents of the container, QWindow's destructor crashes when deleting QQuickText.
This works in 5.6.0 beta, but crashes on 5.6.0 RC in
Qt5Quickd.dll!QQuickItem::~QQuickItem() @ qquickitem.cpp Line 2333
Attached example to reproduce the crash. Use the debugger in a debug build.