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When a new QgsAbstractGeometry is set on a geometry object, the previous child is deleted. If the previous object was constructed by Python, it's wrapper will still be alive for as long as the QgsGeometry is alive. If a new QgsAbstractGeometry is constructed at the same memory address as the old one, the wrapper will be reused with wrong type (and other) information, leading to all kind of weird issues. See also https://www.riverbankcomputing.com/pipermail/pyqt/2019-January/041251.html