(Solved) When exporting an FBX mesh into roblox from blender some faces become invisible

image
(in blender)
image
(in roblox)

like the title said, the faces become invisible, i have tried things from triangulating faces to recalculating outside normals, but one thing thats weird is that, when i try to import it as a MeshPart the missing faces becomes visible, unlike what happened when i try to import it with “Import 3D”

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SOLVED

i dont know why it happened but i just checked the normals and the “ring” that had its faces missing were looking weird so i just deleted it, copied one of the rings below and placed it exactly in the same spot and it fixed it.

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This can also be fixed by enabling the double sided property.

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double sided property often breaks the lighting of the object and cause weird shade effects, make sure to check the normals in blender

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