The zombie arms (all types of zombies) have their old outdated arm position.
The skeletons arm position has been updated for having their both arms holding on their bow rather than just one.
The updated arm positioning for the zombies have a slightly lower angle (-45*) when attacking a mob and when it’s neutral and an increased arm positioning an increased angle (+45) when pathfinding.
The screenshots shows the differences between
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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Please update the ticket to clarify:
What makes you say the arm position is "old"? Was there a change in Java Edition? If so, when?
Which screenshot shows which position, good/bad/old/new/Bedrock/Java?