congratulations beautifu breed !!!!! Do you have a (at a distant reward system) established. It would be helpful if you did like a, word reward or clicker. do you have a stay and release behavior established? (Both sight and out of sight) If the door is such a trigger for negative learning, Dutch shepherds are so working smart you don't need the door of the crate to teach the behaviors first.
I would start with what I need the pup to learn first, use an open crate, is any dog especially a smart working dog capable of staying inside a crate with the door open until released "yes"
I would start with what I need the pup to learn first, use an open crate, is any dog especially a smart working dog capable of staying inside a crate with the door open until released "yes"