Skeletons still running to you even you're "disguised"

I was fighting and when I tried to "disguise" in a double plant (big plant), the skeleton stopped attacking me, but still running and pushing me (so I got off the disguise and died)

To test it just create a map with grass and a big plant/double plant and spawn a skeleton. Put yourself in survival mode and try to "disguise".

(Sorry if bad English)