The bug:
Occasionally jumping into fly mode, I get stuck as if a block is above my head even though there's not.
What I expected:
To fly away by double tapping "A".
What happened
Got stuck in mid air not being able to fly up, which letting go of the "A" button will result in falling even though you're floating off the ground.
Solution or Temp remedy
Opening chat window fixes it immediately everytime.
Recreating
Making it happen doesn't seem to be fruitful. All I can say in this regard is, play more Minecraft? 😀