The old code only worked when built-in nodes are only unregistered at most once while Blender is running. However, this is not the case when running certain unit tests such as `AbstractHierarchy*` in `blender_test`. Found by Sybren, thanks.
The old code only worked when built-in nodes are only unregistered at most once while Blender is running. However, this is not the case when running certain unit tests such as `AbstractHierarchy*` in `blender_test`. Found by Sybren, thanks.