QAbstractItemModels returned by a Q_INVOKABLE are getting deleted prematurely

A QML Repeater is using a model returned from a Q_INVOKABLE from a obejct in the context. The model is allocated on the heap and owned by QML. After a number of dataChange events from the model the model object will be destroyed by the QML. The model view will remain but no longer update.

I modified the basic QML abstractlistmodel example. It starts a timer and continually updates one of the records. The data change is reflected in the QML, which is expected. After 646 times in non-debug mode the model will be destroyed. After 400 or so times in debug mode the model will be destroyed. I haven't found the source of the delete invocation but it's coming from some where with in the QML framework. I've attached the simple test. When the model gets destroyed "Model destroyed" prints out on the console.