Document template doesn’t inherit default metadata settings

For one of our customers I am trying to achieve the following: A project document library contains a content type called project document. The content type contains unique metadata such as customer & project name. It also contains a document template with quick parts referring to these two fields. I am able to use the document information panel to automatically fill these fields when creating a new document based at this content type. This is not the issue! The following is: I have set default values on the project document library for the customer & project name because all the documents are related to this customer and project. Unfortunately after creating a new document based at the content type the customer and project name aren’t automatically filled. Does anyone have experience with this issue? Thanks for the help 🙂

Edit 31-07-2015

I did some testing with my colleague Jordy. The content type and template worked fine in a new document library but not the existing. We created a new content type with template but this one also doesn’t work in the existing template. This worked fine in the new document library.