The `item replace` command only allows putting saddles into copper golems’ saddle slot

Steps to reproduce the issue:

1. Spawn a Copper Golem

2. Try to add a poppy (or any item) to the Copper Golem’s saddle slot using the following command:

   /item replace entity @e[type=minecraft:copper_golem] saddle with minecraft:poppy

Expected result:

The Copper Golem now has a poppy in its saddle slot, displayed on top of its lightning rod

Actual result:

The game outputs the following:

No targets accepted item [Poppy] into slot 106

Additional notes:

• Iron Golems can place poppies into the saddle slot

• Saddles can be placed into the Copper Golem’s saddle slot