This bug needs to be fixed soon because I don't want to keep wasting totems and fireworks to see if I get the super sonic achievement because when I fly down at max speed (I included fireworks) I go through a 1x1 gap and don't get the achievement, and this makes me very disappointed on the resources I wasted. 😞
Thank you for your report!
We're actually already tracking this issue at MCPE-55142, so I will resolve and link this ticket as a duplicate.
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