What happened to this phenomenon

Questions
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1

i use OBJLoader and MTLLoader
This is the normal display
%E5%9B%BE%E7%89%87
This is an error display
%E5%9B%BE%E7%89%87
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

2

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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