It's part of the fix's language in the patch notes is because it was already tested and confirmed to behave this way in closed testing. Having any damage break the 'Hidden' status given by these powers/proc is working as intended(see attached img below. 'Hidden' is called "Meter" internally), but that's contrary to how it has worked ever since this bug has existed, and as a consequence of fixing it, the fix has made Placate and the ATO substantially less useful than when the bug was present. This has the knock-on effect of being a massive nerf to resistance Stalkers' damage output, as well as making the mechanic less consistent for any Stalkers, as well as Soldiers of Arachnos. My feedback stands: The Cancel On Damage Flag in Placate and Stalker's Guile makes those powers/procs inconsistent in gameplay, and they need to lose Cancel On Damage Flag for the 'Hidden' portion of the effect.