I have a similar thing from a starter opened at halloween, I pulled Scotty Fold with Scotty Fold rather fast but every baby hiding the ear was a boy same as the starter so a backbreed was impossible until a girl finally droped 7 weeks ago, unfortunately she and her brother are reluctant to pass the hidden and confirm if its Scotty Fold or something more recessive which I now know would be Equine.
I had another starter last year pass 15 genesis pearl boxes before finally passing AS Cream & White Tabby on his final box. Extraordinarily frustrating.
I think certain cats just delight in mking us tear our fair out