TLDR: crafting card while it's in your companion slot in deckbuilding results in the card being in your collection but not being able to put it in your deck

I didn't have Obosh, the Preypiercer but crafted it while it was in the companion slot of a deck that I was theorycrafting. When I go to save the deck, it says "Invalid Deck: Deck contains cards not in your collection." even though Obosh is visibly in my collection now.

This used up one of my rare wild-cards, but Obosh is not in my collection?