The player can not shift when is stan up on a boat.
Linked issues
duplicates 1
Comments 2
Forward-resolved towards MC-158131. That ticket has more details, votes and watchers. If you would like to add a vote and any extra information to that ticket it would be appreciated.
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This is the same for shulkers as well. I assume this is true for any entity that you can stand on. You are slowed as if you’re crouching, but there is no crouching animation or eye level change.