Geometry cache use two sided material,the result error.

i import abc file as geometry cache, import options like this:

234764-01.jpg

i use one sided material,everything ok:

when i enable two sided options,the results become strange,like the normal reversed:

so is my setting wrong?or this is a bug.

Hello,

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https://forums.unrealengine.com/unreal-engine/announcements-and-releases/1410408-unreal-engine-bug-submission-form

Thanks