Unable to Sprint Swim
Double tapping the “up/forward” button does not let the player swim through the water.
In order to swim, diving down and then double tapping the “up/forward” button, will sometimes allow the player to swim. Once the player head is above the water, you’re unable to swim.
Thank you for your report!
We're actually already tracking this issue at MCPE-58953, so I will resolve and link this ticket as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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