Can not go above the world hight of 320
but
there are some places where you can go above
By the way, i am holding space bar
you can go on top of the border, if you wear an elytra, in creative and hold space bar, then quickly double tap to fly, then you glitch though the invisible border
Here's a small clip of this bug
https://youtu.be/Wk1iogH6KUw
Thank you for your report!
We're tracking this issue in MCPE-141360, so this ticket is being resolved and linked as a duplicate.
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