Experiment 1: When I was playing a Skyblock map, I found out that when falling, I begin getting void damage at Y~+25. Maybe even higher, +25 is when I noticed it.
Experiment 2: I enabled Education Edition commands for this map to unlock flying ability ("mayfly") and flew under the island, highest Y on which I received void damage this way is Y=+55. It's worth noting that this void damage is inconstant, unlike on negative y, and may work this second and not work next second even if you don't do anything.
Experiment 3: To ensure it's a vanilla bug and not a modded thing, I cleared 100x100 zone in a normal world filling it with air using commands and built a small platform above me. I enabled the mayfly ability again and changed gamemode to Survival, and I got void damage again.
Related issues
Comments


Yes and I think there is an issue where the game thinks you are above and on the gound at the same time, if you go fly with mayfly and have someone else watch you, the other person will see you basically jumping up and down, I've also seen hackers use fly hacks and they too bounce up and down really fast.

Relates to MCPE-105490

Thank you for your report!
We're tracking this issue in MCPE-105490, so this ticket is being resolved and linked as a duplicate.
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When I fly in adventure or survival mode in 1.16.100, I randomly take damage which I'm assuming is from the player's position hitting the ground. I also take lava damage when I fly over lava. I also have a scoreboard that detects if I'm and on the ground and it inconsistently flashes 1 and 0. In the video:
[media], Deaths, on the bottom in the action bar display slot for /title, is what displays if I am on the ground for not. 0 is on the ground and 1 is not.
To replicate, fly around with /ability @s mayfly true in survival or adventure mode. What should happen is I just fly around like I am in creative mode and not die, but what happens is I take damage and die.