If Foxes have no AI, sleeping, and it's thundering, they will wake up

Hello Mojang,

I was messing around with Foxes in the latest snapshot. I spawned one with no AI while sleeping on top of my bed using /summon fox ~ ~ ~ {NoAI:1b, Sleeping:1b}. Then, it started to thunder. The fox woke up and stood still, creepily. This is not supposed to happen, as they should stay sleeping. Hope you can fix it, as it would be good for mapmakers.

Best of luck,

RyanCraft77