System Information
Win7 x64
Blender Version
Broken: Blender 2.69 r60995
Worked: unknown
The new area will correctly display the same node tree as the original area, but bpy.context.space_data.node_tree will be None and the header's template_ID UI element will be empty.
Exact steps for others to reproduce the error
- Create a Python node tree
- Split the Node Editor area
Demo: