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Vuforia trims the top edge of my model

I try to change coordinates of my model but this didn't solve a problem. Vuforia trims the top edge of my model.

 

Please see my screenshot1. This is original model. Everything is ok.

Image removed.

 

If I rotate a camera I got a bug. Vuforia trims the top edge of my model. Please see the screenshot2

Image removed.

 

I can change my z coordinate or scale my model but it didn't helped me.