when you hold spacebar, and then open a chest or other GUI, you will continue jumping when you are in the GUI, even if you let go of spacebar. if you don't let go of spacebar however, and exit the GUI, you stop jumping, even though you are still holding spacebar.
We're tracking this issue as MCPE-54571, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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