Zmodeler3 glass problem

I wanted to make this regular Dodge Durango like Voight's Durango from chicao pd using zmodeler. Of course, it's only for my use. The problem is that the original car has a broken window, but if I make a simple modification to any kind of car, the windshield collison disappears. I don't know why this keeps happening, and if there's a way to fix it, I'd like to know. I looked for YouTube videos, but they were all from years ago. I hope the translation is correct. I'm not good at English, so I used Google Translate.

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I wanted to make this regular Dodge Durango like Voight's Durango from chicao pd using zmodeler. Of course, it's only for my use. The problem is that the original car has a broken window, but if I make a simple modification to any kind of car, the windshield collison disappears. I don't know why this keeps happening, and if there's a way to fix it, I'd like to know. I looked for YouTube videos, but they were all from years ago. I hope the translation is correct. I'm not good at English, so I used Google Translate.