Template hierarchy issues

Stacking template hierarchies seems to have some issues. See attached example.

Traceback (most recent call last):
  File "pytemplatechild.py", line 52, in __init__
    self._testlabel.props.neem = True
AttributeError: 'Child' object has no attribute 'props'
noom True
neem True

Creating the object in the widget directly does not exhibit this problem (see the notes in the example).

pytemplatechild.py