Steps to Reproduce

Import the attach skeletal mesh, set the second material slot to use the first material then export the asset.

Open the exported asset in a DCC and verify if the materials are set properly.

Result there will be a material name Fbx_Default_Material_1 for the second material

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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-205483 in the post.

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CreatedJan 31, 2024
UpdatedFeb 23, 2024