I was suffocating by walking under a tree
What I was expecting to happen was to walk past the tree because it was 2 blocks above me.
What actually happened was I got stuck 1 block away from an oak tree and couldn't continue walking, and began to take damage, as if I was suffocating.

I was mining out a mountain area and there was a tree 2 blocks over my head. When I tried to walk under it to continue mining, I got stuck under it, but I could back up. When I tried to keep going, I took damage as if I was suffocating in blocks.

Steps to Reproduce:
1. Dig an area out from under the tree, 2 blocks down. Preferably plenty of space around it.
2. Make sure your able to see the sky when around the tree, so there's no blocks around/above you.
3. Attempt to walk under the tree, and keep trying to walk forwards.