PrimitiveWidgetWrapper - where does that come from

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Hi all, I’ve just created a simple widget using the _TemplatedMixin and when I use this widget in an app the widget is always rendered with an additional node which shows as PrimitiveWidgetWrapper (full id is mxui_widget_PrimitiveWidgetWrapper_0). Does anyone know where this comes from? I’ve seen this before but don’t really know what is triggering this, because other similar widgets don’t have that. thanks Fabian
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