io_scene_lithtech
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Fixed custom normals for Blender 4.1 and above
Attribute normal from MeshLoop is read-only since Blender 4.1. Assigning a value directly causes runtime errors. Using normals_split_custom_set is a universal solution for Blender both modern and older versions, including 2.8.
Thanks! I've applied it to my repository https://github.com/MelissaAutumn/io_scene_lithtech/commits/master/.