wp_link_pages arguments “after” and “before” not right

I noticed what I think is a bug in wp_link_pages where the “after” and the “before” doesn’t apply to each link and is applied to the whole argument. This hasn’t changed in the past few versions and I wonder if its my interpretation of what the “after’ and “before” should do. I “fixed” it but not sure if this is a bug or not. Anyone else agree?