Not Listitems all are not showing in JSON Format

I have a SharePoint list with 9 person columns. In the normal list view with all 9 person columns, all people are displayed. In addition, I built a nice JSON view in which only 3 person columns are displayed. The other person columns are not displayed. All person columns have the same structure:
[$field_x.title]
Can someone tell me why not all values ​​are displayed in a JSON formatted view and the person values ​​are displayed in a normal view.