Topic here:
https://forums.playcontestofchampions.com/en/discussion/131250/sabretooth-no-longer-bypasses-mordo-evade#latestMiike's comment:
Nobody should be able to reduce Mordo's Ability Accuracy, and that should include Sabretooth. This was definitely a bug that was fixed, and I think it was due to the improvements made to the consistency of Abilities triggering.
Miike, I'm sorry, but you are 100% wrong.
Abilities in question:

Mordo is immune from passive ability reduction. No Mercy is active. In fact, in Mordo's description it says that astral evade will not trigger if there is an AAR debuff such as concussion. When a stun is applied with No Mercy it is a debuff thus granting the synergy bonus.
This isn't a "bug" that was fixed as the synergy bonus is still applicable. This is a frame rate issue that prevents ST from attacking within .7s after the stun; thus, preventing the synergy bonus from happening.
Again video evidence here:
https://youtu.be/w_JYq934chgIf you want to change No Mercy from bypassing astral evade... fine. But, don't tell us it's a "bug" when it's clearly not and actually goes against the abilities' descriptions.
The only "bug" is the frame rate that prevents ST from immediately attacking after a stun.
This is a legitimate issue and shouldn't be dismissed with an incorrect explanation and a thread close.