Zombie Horses have Z-fighting at the back of their necks when they are armored where their mane would be covering were they normal horses. This is especially visible with the grass eating animation and head turning animation.
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Here is a video displaying the bug, as well as its absence in regular horses (the reason for which seems to be their manes covering the spot.
Hi!
Thank you for your report!
We're already tracking this issue at MC-302792, so I will resolve and link this ticket as a Duplicate.
I suggest also to browse through the main issue for potential fixes.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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Thank you for your report!
Could you please provide a video showcasing the issue?