When you are holding space bar/your jump button, and you open a command block, structure block, or another menu, you continue to jump forever. Only started happening as of 1.13.0
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[Mod] Celesian
Thank you for your report!
We're already tracking this issue at MCPE-54571, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated. If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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This has happened to me before when I'm checking my Global Locker in the Hive server.