fix?

common/scripted_triggers/00_diarchy_scripted_triggers.txt

@@ -468,6 +468,7 @@ valid_co_emperor_candidate_trigger = {
 					}
 				}
 				scope:co_emperor_temp = house.house_head
+				any_held_title = { is_noble_family_title = yes }
 			}
 		}
 	}