Why some meshes got inverted normals in roblox?

When I trying to import ANY mesh to Roblox, half of time, it got all normals inversed:
image
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So, in this example you can see that character’s legs got inversed. The only fix I know is recalculate normals INSIDE of mesh, but it’s not how it should work. Can someone tell me, how I can fix this? (Or make a bug report if it’s bug)

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Maybe it has to do with the version of blender you’re on?

Perhaps this is why Unions are going weird.

Old mesh importer has no flaws. So this bug occurs only with new importer.

Found strange reason:
My objects in blender had rotation and scale set not to (0, 0, 0) and (1, 1, 1) respectively, and this somehow bugged importer. But old importer still imports all correctly…

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