In 11.0.7 we’ll finally get our hands on battle pet “Slim”, formerly listed as a reward for WQ “Gutter Work” (which was maybe active 4x since launch with other rewards). GM responses for player tickets suggested further storyline developing in future patches, but obviously, you had something else in mind…
Now for 11.0.7, it was changed to be a reward for the final quest of the “Gutter Work” storyline, but it is also listed as the reward for an achievement tied to completing this quest. This alone would be less confusing if the (achievement) pet was handed out retroactively, but that is not happening on the PTR, so players have to repeat the storyline.
But we have a severe issue with this storyline on the PTR:
We are supposed to loot the Familiar-Looking Appendage quest starter for “That’s Pretty Gross,” which is required to proceed to the third and fourth quests.
For whatever reason this item has a different name on the PTR Emerald Necklace and won’t start this quest so we get stuck.
This is still the case in Release Candidate 58046 three days before release.
The only workaround right now is to complete at least the first two quests on Retail servers before 11.0.7 is launched (and would bug this quest starter), so please fix the item's issue & maybe the achievement (to work retroactively). Looks like you at least thought about it for a second because Slim's pet summon item got a max count of 1 (instead of 0) in a recent PTR Build.