Errors occur when moving duplicated Material Instances

Licensees have reported that two UMaterialInterfaceEditorOnlyData objects are being created for duplicated assets, causing a name conflict when renaming.

1. Create a Blank project.
2. Create a folder "NewFolder" under Content folder.
3. Create a material instance "NewMaterialInstanceConstant" under Content.
4. Duplicate NewMaterialInstanceConstant to create "NewMaterialInstanceConstant1".
5. Move NewMaterialInstanceConstant1 to a "NewFolder".
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6. And the following error message is displayed and the move fails.
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/Game/NewMaterialInstanceConstant1 - An object named '/Game/NewMaterialInstanceConstant1.NewMaterialInstanceConstant1' already exists.
Couldn't rename `MaterialInstanceConstant 
/Game/NewMaterialInstanceConstant1.NewMaterialInstanceConstant1'

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