Pets Disappearing on map

So did Blizzard nerf hunting for rare version of pets? I have always just killed it if it wasn’t rare and moved on to the next one until I got a rare and now it seems when I kill the pet after it’s not rare it phases me out to where I can’t see any pets in the zone anymore and I have to leave the zone and come back. Is this intended or another “Unintended bug” on Blizz side.