So I just had an interesting exchange with 100games100days about the classification of Maryannu and Saka. (this is a great channel, I really recommend it). Since the introduction of R&F, both of these units, together with the Keshig, form a class called Ranged Cavalry. They follow the promotion table of Ranged but behave as a mixture of both classes. This has been the case for the longest amount of time. Now, only Saka and Keshig remain as Ranged Cavalry while Maryannu is now only ranged, which means they cannot be countered by anti-cavs and do not receive production bonus from cards that boost cavalry. I tested it and can confirm. This seems to be an unintended bug that the devs introduced somewhere along NFP.