Pagination for a cpt filtered with a category

Screw using a category. I manually added the tab to the nav-list and disguised it as a category. The posts are filtered by a “special” tag that doesn’t need to show up anywhere else. The custom post type looks for that tag and has fields for month and year. Archive-* and single-* template pages display according to plan. Everything works now. Thank you very much to everyone who helped out.