What happened to this phenomenon

i use OBJLoader and MTLLoader
This is the normal display
This is an error display
what happened?Unbelievable
Other models adopted ExtrudeBufferGeometry EdgesGeometry LineSegments
Please !

add one ExtrudeBufferGeometry shows normal
Analyze the possible causes of errors
Simple fiddle can’t be reproduced

Please provide more detail if you want help. We can’t guess what’s wrong from screenshots. Share code, the models, or a live demo.

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