I've found up to 13 in one Burial Chamber. A few with none, or 1-2 though. RNG is huge with the dungeons, but overall they seem to be a lot more rewarding than pre H and H. Might just be RNG favoring me though. Iron seems to be a lot easier to find as well. Just seems to be a lot more treasure and rewards in the various dungeons that I've explored. They seem to be better generated as well. Burial Chambers especially with a decent amount of vertical exploration.

Enemies seem to be a bit nastier though. Saw a lot of 1/2* skellies, and a fair few Putrids when I was farming up Cores post-Eikthyr. There also always seems to be one corridor off the entrance, at least, that doesn't have a door in it, so I'm fighting right from the start when they wander into the entrance chamber.