Hmm might have spoken too soon, I believe this is the explanation:
EDIT: Might have spoken too soon again … the Document.Current and Document.ActiveView nodes were still reporting correctly from what I could tell, but maybe this is because they have matching Element IDs between documents since it was a new Revit family from Detail Item Template
… the Document.Current and Document.ActiveView nodes were still reporting correctly from what I could tell, but maybe this is because they have matching Element IDs between documents since it was a new Revit family from Detail Item Template