Sulfur Cube AI does not recover immediately after replacing held block with air via command

Description:

When the block held by a Sulfur Cube is replaced with air using the /replaceitem command, the entity does not resume its normal AI behavior until a player holding a block comes within proximity.

Steps to Reproduce:

1. Summon a Sulfur Cube.

1. Use any block on it so that it picks up the block and holds it in its weapon slot.

1. Run the following command:

   /replaceitem entity @e[type=minecraft:sulfur_cube] slot.weapon.mainhand 0 air

1. Observe the Sulfur Cube’s behavior after the command is executed.

Observed Result:

The Sulfur Cube remains idle and does not perform any actions until a player holding any block approaches it.

Expected Result:

The Sulfur Cube should immediately resume its normal AI behavior after the held block is replaced with air, without requiring a nearby player holding a block.