Why parts of static mesh can't be draw correctly when enable nanite support.

Development Asset Creation
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1

Hello .
I got a problem about static mesh. My parts of my static mesh can’t be draw correctly when i enable nanite support.And i am tring to change Nanite settings ,but does’t work.And when i disable nanite , everything goes well. What the problem is ? Thanks!

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I am working on UE5 5.0.3.