RestrictedInventoryEvery slot has a purpose.

Lock player inventory slots to an item, tag, or exact component variant while keeping Minecraft's normal inventory behavior.

00–35
Slot-level control
Restrict any hotbar or main-inventory slot while leaving every other slot untouched.
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Items and tags
Match one registered item or an entire item tag, with a cycling ghost preview in-game.
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Variant-aware
Pin a slot to exact variants such as an enchanted book, potion, or tipped arrow.

Slot-level control