The bug
Maps in item frames display Z-fighting when viewed from a distance.
To reproduce
Place some maps in item frames.
Move far away.
Look at them via a spyglass.
❌ Notice Z-fighting.
Expected Result
They wouldn't Z-fight.
Related issues
is duplicated by
relates to
Attachments
Comments

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I can confirm that this is an issue. This is more commonly known as z-fighting. 😃

To be clear, the spyglass is just an aid to see the z-fighting.
Here is an example (without a spyglass) from v1.21.1:
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