Hot Karl gave me Collaborator?

I received a message from Hot Carl, it showed a legendary, and I eagerly accepted! I checked my backpack afterwards, and found…a blue collaborator?? I can’t remember for sure if I’d already had that in inventory (I took a few days off) but either way, no legendary to be found.

I seem to be having a LOT of issues with loot. Either mysteriously vanishing, or not showing up at all.