When dhooking (explanation below) with a sandstorm in a bottle while holding out an item, the player uses a regular sandstorm jump (horizontal movement speed and animation included), whereas in vanilla, the player only gains the height from the jump and doesn't have the spinning animation. This bug doesn't occur when dhooking without a held item.
Dhooking: When the player jumps, there's a timer associated with the jump that ticks down. This timer is paused when the player is hooked, and can be continued once you let go of the hook. In the clip, I'm starting a sandstorm jump, pausing the timer by hooking, and continuing the timer once I unhook.