Invisible pet awarded that was removed in DF

Remember in DF when they added more pet collection achieves that were higher than what could be gotten but then were removed? Well when I collected my 1800th unique pet today I got the rewards…kinda. No achievement popped but my chat log said I was awarded the pet Mister Muskoxeles and the title “Knight of Feathersworth”. The title works, but the pet is still invisible in my pet ui after “earning it”.