Document template of content type (in content type hub) not found when creating new document

marco_du_cato I managed to reproduce the behavior on 4 different tenants.

Seems like a general problem with synchronization between the Content Type Hub and a site's document library.

Steps to reproduce:
1. Go to SharePoint Admin Center > Content Services > Content Type Gallery

2. Create new Content Type > Inherit from "Document" parent Content Type
3. Attach a custom document template to the above Content Type and Publish

4. Create a new site (or use existing one) > Go to any document library

5. Add above Content Type to library

6. Trying to create a new document based on the above content type results in a 404 Not Found error.

From my observations the file is not being correctly uploaded to the document library's Forms folder, where SharePoint keeps the document templates.

Anybody else have this or knows what's happening?