If in half slab high water and you hold forward against a wall it make the player jump without pressing the space bar. Auto-jump isn't on either.
This can't be done in corners, only flat walls.
It's also worth mentioning this increases:
scoreboard objectives add Jump minecraft.custom:minecraft.jump
without have to press the jump key.
Thank you for your report!
We're tracking this issue in MC-8959, so this ticket is being resolved and linked as a duplicate.
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