"Deadly Prey" beast farm not working or not clear

Hi,

I have been running beasts almost every league and recently tried that silly keystone "Deadly Prey" which gives me stacks 5% quant/rarity from slain beasts, but it doesn't seem to be working at all or the impact is so small. I got to 20 stacks which should give me 100% quant and rarity from slain beast so I went to harvest last, mind you full tree and dupe scarabs and I got almost nothing.

Does anybody know if it works with harvest or with which items does it work? They are all beasts but no difference with the stacks and without.

Screenshot for reference:
+ Harvest dupe scarab
+ 40% pack size

That is the thing, it doesn't say and also all the monsters after receiving the stack are tagged as beasts and I do seem to deal increased damage and receive less, but no quant or rarity.

"

seaman wrote:

I think this only applies to Einar's beasts, not to all beasts on the map.
Also on the wiki it is mentioned that Player quantity modifiers have no effect on lifeforce.

If that is the case then sure, it should not bother me, but having a stack of 37 which should give me 185% quant and rarity from monsters with beast type + 103% rarity on gear, you would think that I would have gotten so much more gold as both stats affect the gold drops.
I have gotten terrible results on a 90%+ quant map with pack size increased etc. and averaged on around 20k gold which is an absolute garbage.
Seems like this node is an absolute time waste in its current state and also not clear at all.