There are a few abilities that will trigger damage procs from stealth which will not only pull you out, it can also fail to trigger the subterfuge window. Ones I found at least last season were adrenaline rush with fatebound (will trigger a damage coin) or roll the bones/snd/any other ability that doesn’t normally break stealth triggering your cerseis circlet or damage enchants and trinkets. (Sap has been fine)
Fairly annoying, but a way to beat avoid it is not to target them until you know you want to hit them for sure.