I am playing a Warlock and have specced into hollow lich node from Lich tree. It converts all sources of leech to general damage. But for some reason I still keep the leech while also gaining the damage bonus. Which in my case is a bad thing, since I generate more ward and more damage from missing health. I have a total of 3,5% spell damage leeched as life, 2,5% from tree, 1% from a pair of unique gloves. Which gives me 35% increased damage. But I still have 4% spell leech in my character sheet (it’s rounded up from 3,5%). And for some reason the leech still works as well. I’ve attached some pictures.
EDIT: I found out the leech on character sheet stays even after allocating the node, but I can confirm that the leech still works since it constantly fill my hp.
https://i.imgur.com/0Bqm4uh.png
https://i.imgur.com/JP5RsAU.png
https://i.imgur.com/4rvh3m6.png