Changing Material Changes Navmesh Generation

Behavior
Materials have an unexpected effect on how the navmesh is generated.

NavMeshMaterialBug.rbxl (53.6 KB)

Reproduction

  1. Insert some parts next to each other, works especially well witch wedges or angled parts
  2. Change the material of the parts to all be the same
  3. Change the material of the parts to all be different from each other
  4. Change the material of the parts to all be Plastic (specific unexpected behavior tied to Plastic)

Demonstration

(If this is fixed in two weeks this is perfect for us!)

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