Importing single mesh object in Threekit from Maya


I am facing a weird issue when importing an object (single plane, single mesh) from Maya in to Threekit. In Maya, back side of the mesh is displayed black but in Threekit, its see through instead. To fix this issue, we are creating another mesh but this is adding extra effort and also increasing the size of it for no reason.

Any guidance here would be appreciated

Is the entire mesh see through or only one side?

Only one side has the issue

If you click on the mesh → properties do you see a box called Double Sided and is it checked?