Spiders spawning with potion effects

I was playing a hardcore world on the latest snapshot when I came across a bug that has happened to me multiple times. I was in a cave and I saw a spider with a pink potion effect (most likely regeneration) and I have also saw I spider with the invisibility effect, although I could still see its eyes. This doesn't happen to every spider but it is still something that has happened to me multiple times in this snapshot and should be fixed.