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Datasmith doesn't generate Lightmap UV's anymore

Hi,

I have an issue with Datasmith and its UV generation.

Basically, since version 4.20_E4 it doesn’t generate correct UV’s anymore.

I’ve made a simple scene.

Export mesh from 3ds Max 2018 using both Datasmith and .FBX.
Create new project.
Pick VR Template for desktop.
Use the auto generated standard lit map.
Import my mesh through Datasmith and .FBX.
Build the lighting.

The attached images show the difference between the two.

It was working fine in the previous versions. Now I am wasting so much time and can’t work in 4.21.

Thanks,
Luigi