Alchemy Lab III doesn't drop corrupted Soulcore if you use Craft option

I assume this is a bug. I know this is supposed to drop a Core Destabilizer when you click Take. Since I had a Soulcore on me, I just decided to use Craft. I killed the boss that woke up, and then I didn't get anything. That can't be intended, right? If so, WHY?! I really hope it's a bug. Otherwise, it's yet another thing wasting the player's time and making effort go unrewarded.