I'm guessing you already know this bug since it seems fairly gamebreaking and easy to encounter, but I'll just give my experience. There are several instances where remove and exile are confused in the game. This occurs both on card descriptions and in how the game treats your deck. For example the fire sprite in galactic says it brings back removed cards when it brings back exiled cards, I think Parasitic Succubus does this same confusion too. That brings me to the real problem. For some reason in both my Dark Fairy and Parasitic deck, when I start removing cards I can no longer accurately search cards in the discard deck. I noticed it in my Dark Fairy deck first but just recently when I was trying out Parasitic I noticed the glitch again and then somehow I retrieved a set of wrong cards again using Rapid Recovery except it included a second Card Destruction when I only had one of the card in my deck.
Playing version 7.9 win