Nanite breaks tangents

Development Asset Creation
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1

I was testing our baking system in Substance Designer and wanted to check if our normal maps are still synched with unreal.
By default, Nanite support is enabled and the result is wrong.

UnrealEditor_7Wu4E4svt7
UnrealEditor_7Wu4E4svt71725×1015 115 KB

Disabling Nanite shows a correct result:

UnrealEditor_uDZtxSMxPn
UnrealEditor_uDZtxSMxPn1725×1015 103 KB

Am I doing something wrong? Is this a bug in Nanite ?

2

I think you need to check explicit tangents on the right under nanite. There’s an assumption with nanite that you’re going to use enough geo that you don’t need normal maps for anything but detail normals.