When using in the chat, When doing the /replaceitem command, armor didn't show when Pillagers and Vindicators are equipped armor:
I typed the command:
/replaceitem entity @e[type=vindicator/pillager] slot.armor.chest 1 netherite_chestplate
It didn't show the armor from the pillagers and vindicators.
Thank you for your report!
However, this issue is Working as Intended.
From the 1.17.40 changelog:
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