Sacrificial Robe Clasp doesn't always spawn?
 

Hello there. I was doing some HS and I was trying to get the key to the North boss's room (The Crypt Keeper). However no matter how long I waited, something like 30 minutes, the key wouldn't spawn on the ground in the middle room like it's supposed to. Is the respawn timer actually that long? Thanks for reading!

Now it's been over an hour.