2bf46b3189
When loading an unknown node type from a newer Blender version, the node storage data cannot be properly loaded. Re-saving the file will then crash if saving with the same node type idname, since new Blender versions cannot find the expected storage data. Loading in older versions should replace unknown node types with a dummy "Undefined" node that will get loaded as `NodeTypeUndefined` in newer versions as well. Custom node types are exempted from this since they store all data as generic ID properties and can always be fully serialized. Pull Request: https://projects.blender.org/blender/blender/pulls/114803
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