Roblox fills in vertices for no reason when importing meshes

So, I am trying to do a commission, and I encountered this problem when importing my meshes.
Roblox fills unwanted vertices even when in blender, those vertices are not filled.
Here’s what I mean:
image
It is supposed to be like this:
image
I have tried moving parts of the mesh and trying different import reconfigurations but nothing has worked. Any help is greatly appreciated.

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Check your triangle count. You might be over 20k for a single mesh. If you are, Roblox will remove vertices until you are under the triangle limit.

Otherwise, I would look for tears in the mesh in blender.

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I found no tears in the mesh and the triangle count is way less than 20k. I tested this and I still have the same problem.

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This will be difficult to debug withou having the model in hand, but one thing that helps is to reload the fbx file into a new blend file, and see if the error is part of the export.

try to triangulate it in blender, Roblox sometimes messes that step up when importing.

your mesh’s render fidelity may be “Performance”, which will merge nearby vertices to lower tri count.