Bug in Java 1.14+, when using the programmer art textures, zombie villagers are missing their arms, and have green pixels floating around their head.
Related issues
duplicates
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Thank you for your report!
We're actually already tracking this issue in MC-140954 and MC-148250, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to these tickets it would be appreciated.
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Confirmed for 19w35a