Unable to jump or move upwards when below the flatland if feet are touching the ground

So I updated my game today, and it seems that after the update, I was unable to fly or jump when underground a superflat land (basically below ground level). It is really game breaking because I am trying to make a deathmaze map, and some parts go below ground level, and if you can't jump, it can really ruin the map. Please fix this. I am using a Note 9 if that affects anything.

 

Here is a video to see the glitch in action: https://youtu.be/OpGQfoDu8DQ