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Villagers with some blocks in head slot either display incorrectly or are not able to be placed

replaceitem slot.weapon.offhand not working for mobs

Only visible slots are updated clientside when you are inside an inventory

block states can't be used in /give, /clear and /replaceitem, but can be used in /setblock /fill /execute detect and /testforblock

Cannot remove horse saddle using /replaceitem

/replaceitem and /give no longer allow stack sizes higher than max stack size

Skeletons without bows can still shoot arrows

Strange /replaceitem command behavior

Slot IDs "hotbar.0" and "container.0" are the same

/replaceitem allows incongruous slot types

/clean an item crafted in the Crafting Table then /replaceitem to armor slot makes a ghost item