Bug creating new documents from document library web parts.
I've noticed an issue with modern document library web parts in pages.
Creating a new document from a document template via the "+new" menu in the new "modern" look works fine in that it generates a blank document to be saved into the library.
When you use the same "+new" menu from a document library web part on a page, word opens but you end up editing the base template rather than creating a new document based off that template.
The same behaviour applies whether the word file template is a .docx or .dotx file.
In summary, the "+new" menu from the main document library views work fine, but from a document library web part embedded in a page, the new menu is not behaving as expected.
Nick Snelling commented
To add to this, the modern document library web part only shows the classic new item list, where as the main modern list view shows the modern new item list.