When we are doing the sand glitch (the hard thing that pros could do), sometimes the game gives a fall damage even if we didn't fall.
If you didn't understand the sand glitch, there is it: https://www.youtube.com/watch?v=tOkyKdUYhLY 0:01 - 0:10
MCPE-114572
Sand glitch glitch (sorry for the weird name)
Resolved
Invalid
0
In the video, the player is clearly falling from a high enough place to take fall damage.