Put the summary of the bug you're having here

What I expected to happen was...:
Autojump would not activate

What actually happened was...:
Autojump caused me to jump

Steps to Reproduce:
1. Place blocks on top of each other such that it goes block - air -block
2. Ensure Autojump is on
3. Walk up to the blocks. Even though it is clearly an impossible spot to jump to, you will jump so long as you are holding forward