Unless Thieves healing skills aren’t classified as “healing” the only time I get a removal when using a healing skill is IF i spec into it.
Please test [Bowl of Saffron-Scented Poultry Soup] skill with use of [Signet of Malice] or [Withdrawl] and if you do try it with [Hide in Shadows] makes sure you don’t have skills into removal for an accurate test. I cannot speak for other classes as to if it is working as intended.
Thank you Anet team.