Shulker Attacks Player Without Shell Opening When Sharing a Boat

Steps to Reproduce:

1.  Travel to the End dimension and locate a Shulker.

2.  Place the Shulker onto a boat, then board the same boat yourself.

3.  Remain on the boat and observe the Shulker's behavior toward you.

4. Disembark from the boat and continue observing the Shulker's behavior.

Expected Behavior:

Per normal in-game mechanics, a Shulker should first open its shell before attacking a player and launching projectiles.

Actual Behavior:

When a Shulker and a player are on the same boat, the Shulker attacks the player without opening its shell. Even after the player disembarks from the boat, the Shulker persists in attacking without opening its shell.