Well that's what I thought too. A bug. But when I contacted the devs about it, the reply I got was that there was only a chance to loot. So that doesn't make sense... Unless the one who was taking my case was misinformed? Well the way the reply was phrased, it didn't seem like it was a bug. Here's the quote

Me
Hi,
It is to my understanding that valuable loot is dropped upon defeating Elite:Krunch and Elite:Bael. However, I did not receive any such thing. I did receive the achievement though, so it cannot be that I was not nearby.

Reply
Hello,


It has a chance at dropping valuable loot, just like everything else. No guarantees.