The seems no systematic/designed solution ,to stop smoke passing through most fire-rated door hinges: between the leaves; through the spaces between the leafs and the knuckle (see white wire in .jpg below); around the knuckle. I can't find a fire-rated smoke seal for hinges and can only imagine a fire-rated adhesive foam - similar to a window draught excluder strip.
BTW please, how far should the knuckle or its pin best be positioned from the jambs?