If you decide to use programmer art from 1.16.4 to 21w08b the zombie villager texture will render incorrectly,showing their arms above their head,this could be a problem for those who want to play the newer editions of minecraft while using the old textures,to recreate it,use programmers art and create a new world,then summon a zombie villager and the bug should appear.
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We're tracking this issue in MC-140954, so this ticket is being resolved and linked as a duplicate.
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