Leather armor equipped on entities or players causes lag

Can confirm in 1.21.2.

Steps to reproduce:

1 Method:

• Create a new creative world.

• Place fire near yourself, so that you can see it while inventory is open.

• Now grab any piece of leather armour. Notice that when you placed it in inventory a small lag spike happend.

2 Method:

• Create a new world with cheats enabled.

• Run the following command

  /replaceitem entity @e slot.armor.head 0 leather_helmet

  Notice that when you run it a lag spike happend.

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