Edit: DE reverted the nerf.
Peacemaker is already a strong ability and the use of Arcane Velocity simply turned that up to 11. While this change was not intended, after some internal back and forth we have made the decision to keep this change. We feel that the two combined makes the already top tier Peacemaker over the top. It still works with Peacemaker, Peacemaker simply cannot trigger it.
We will be editing the patch notes to reflect this."