Well, as the title says, I'm not really sure if this is a bug or something, but I thought it was suspicious.
I was doing a Figure-8 Undead Danger Room in Depth 24, and, some zombies didn't drop anything. Even though some monsters don't drop sometimes, I thought it was kinda weird when the seventh in a row didn't. And when the second wave spawned, I saw that the zombies that were within the radius of the totems when spawning were the ones that didn't drop.
I understand that there was a bug where you could get extra stuff by killing the same zombie several times, so I thought this could be the reversed bug, or something...
Thanks for reading, and sorry for my english if it turns weird at some point c:
Danger Room enemies dont drop much stuff other than the occasional hearths.
It's so you have to actually beat it in order to get any kind of reward.