The zombified piglin when spawned looks like a zombie pigman. If this is intended then the spawn egg should be changed to say spawn zombie pigman. This also occurs when you bring a piglin or piglin brute to the overworld.
Comments 2
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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Do you have any texture packs or add-ons enabled?