FBX importing with strange cuts

We made a sword for our game, but when we import it there’s some strange cuts in the mesh. They don’t appear in blender, only on roblox. We already tried checking off double_sided and reimporting it. Importing it as an obj worked, the only problem is that we need it to be an fbx so that it’s seperated into different parts.

image_2022-11-26_201702600

Any help is appriciated.

I’m not sure if this is the case but it might be due to a polygon limit on Robloxs side.

In Blender did you try to correct which side faces out (normals)?
Tips & Tricks for Blender 2.9 | Show Normals and Faces Orientation - YouTube might help.

Clicking double-sided should only be used to see if the faces are reversed, not to trick them into working improperly.

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