By "movement," I mean by the smoothness of its animations and how smooth it moves.
The following entities have choppy movement on Bedrock Edition, but not on Java Edition.

• Items (MCPE-106124, currently unresolved)
• Boats (this does not affect Minecarts)
• Players
• Piston Heads (which only have 3 frames of moving in their animation)
• Squids (MCPE-117830, currently unresolved)

Steps to Reproduce:
Item:

• Have an Item in your inventory
• Drop it from a high place
• Watch how the Item does not move smoothly

Boat:

• Place down a Boat
• Push, leash, or have another Player ride it
• Watch how the Boat does not move smoothly.

Player:

• Watch the Paper Doll / Have another player join the game
• Watch how the Player's movement is not smooth and stutters.

Piston Head:

• Place down a Piston/Sticky Piston facing up
• Activate it
• The Piston Head has only 3 frames in its animation.

Observed Results:
The entities listed above have choppy movement

Expected Results:
The entities listed above should not have this choppy movement and instead should have a smooth movement as it does on Java Edition.