I really dislike Blizzard / people calling it a “bug fix.”
When you have SST on and you fire off an aimed shot you can see the Serpent Sting projectile fly out just as if you had the talent.
Prior to the patch if you hit a target with Serpent Sting it would proc wild spirits.
Now - post 9.0.5 - if you hit a target with talented Serpent Sting, it no longer procs Wild Spirits.
That was the change. They didn’t fix a bug - they changed an interaction.
So now you have Wild Spirits, that says whenever you hit a target with a damaging ability it will proc Wild Spirits - not proccing when you hit a target with Serpent Sting. That was their big “bug fix.”