I've made it to 1570 in cradle of civilization as timurids and I realized Muscovy hasn't annexed any of their 5 starting vassals. They keep trying, letting it get a couple of months and then canceling for some reason. Poland never annexed mariovia either. however, the Mamelukes annexed their vassel. urbino and monforat are gone. It's very strange has anyone else seen this problem in 1.23 cradle of civ?