In the patch notes for the May 12, 2021 update, under Stitches’ “Gift of the Embalmer” talent the description reads, “Half of this bonus is lost on death.” But in the game he loses all stacks on death, and the in-game tooltip accurately says that.
So, it is only the patch notes that are wrong. Though maybe you might give us the “only lose half your stacks” aspect in-game? I like that a lot better. 
[EDIT] This has been resolved in the live server patch notes.