FBX reimport workflow: Reimport can't import new added Material

• Import Staticmesh A with one material ID into UE4 through FBX
• Assign two materials to A in DCC and export and overwirte A (Here has a B, you can just rename it and overwrite A)
• Reimport A through contact menu right click on it in Content browser

Expected outcome: It should create a new added material in content browser and assign to A properly

Result: No new material generated, and a default WorldGridMaterial was assign to the second material slot of the mesh

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