Chili Bean no longer affects certain zombies

Hey guys,

I'm an avid player of Plants Vs. Zombies 2 - in particular I've been a high-level player (I've reached level 682 on Android and am in the top 25 on the leaderboards) in the Pyramid of Doom stages. Lately, I have noticed that since the most recent update, certain zombies, which used to be affected by the Chili Bean, seem to now be immune to such an effect when they would be affected previously. Such zombies that I have noticed are Pharaoh Zombies with the Sarcophagus broken (with the Sarcophagus still intact, a Pharaoh Zombie should not be affected by the chili bean) and the Buckethead Mummy.

I was wondering if anyone else has noticed differences, and if so, was there a reason for this? That is, is this just a bug/glitch I discovered or were things tightened? If this was intentional, this would kind of suck, because the Chili Bean is in fact a central part of my strategy for Pyramid of Doom.