go in bedrock edition make a big roof then start flying with your head/body touching the roof you made if in survival mod and using a elytra your will take damage while this isnt the case in java and makes flying in nether tunnels VERY hard
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i know this is small but the damage makes flying hard and it isnt on java so its just a bedrock thing
MCPE-31896 is a bedrock bug report. It even says it in its name.
Duplicate of MCPE-31896, it is suffocation damage.