Minor bug, possibly?
When using a boat (tested on a Spruce Boat and an Oak Boat), if the player presses [Ctrl] or otherwise sprints while commanding a boat, then runs into ground on the same level as the water and ejects using [Shift] while still pressing [W], the player will be forced into sprinting, as if it had been toggled on. Double tapping [W] will activate the sprint animation and cease the automatic sprinting.