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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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.
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This has happened to me before when I'm checking my Global Locker in the Hive server.