"replace" property in sounds.json for resource packs is ignored

In response to bug MC-48826, I don't see this being fixed yet. I do not believe that this is resolved at all.

I am trying to make it so that all mobs use the same damage sound. I pretty sure that I'm doing this right, since there are no errors in the launcher log at all. Here's my text:

{
  "mob.zombie.hurt": {
    "category": "hostile",
    "replace": true,
    "sounds": [
      "mob/damage"
    ]
  }
}

I DO have a "damage.ogg" file in the "mob" folder of the sound directory of my resource pack, yet it still doesn't play when I hit the zombie. Is this bug still present, or am I doing something wrong?

Extra Information:
I know that my "sounds.json" file is in the correct place, working, because when I use it to add a NEW sound that I don't need to replace an old one with, it works fine.