f5f9c4f444
If the BMesh already has a "custom_normal" attribute with the wrong type, the call to `BM_lnorspace_update` won't be able to add the attribute with the expected name, and the bevel code ends up using an invalid offset to access the data. For the fix, first just guard against that case. But also make sure the harden normals functionality still works when the input mesh has free normals. They will no be converted to tangent space normals as necessary, in bevel and in other BMesh code that requires that custom normal storage format. Pull Request: https://projects.blender.org/blender/blender/pulls/143489
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