THWACK does not work on Breakable Walls
The perk THWACK! from The Skull Merchant activates upon hooking a survivor. The next Breakable Wall or Pallet you destroy, causes survivors around you to scream and reveal their aura.
However, currently the Breakable Wall part doesn't work, as is visible in the clip shared here. The perk is active and stays active after breaking the wall.
Platform: Steam, PC, Windows 10
Perks, Map, Killer and add-ons visible in clip