Late to the party, but I had this happen yesterday (10 hours ago, according to that little log). Was missing a VR, got the milestone for that one when I pulled it (FINALLY!) but not the core series milestone. I didn't think it'd bother me this much. I'm not sure if it'll fix itself or if I'll have to keep opening packs for it (I'm not going to do that).
So uuuuh, with that in mind, here's a weird request:
If anyone reading this has the Spring Dragon card from Dragonry, would you mind doing a trade for it? As in, sending each other the same card? I'm hoping that'll fix it, if not, guess I'll be sending support an email
edit: the above doesn't work