When one spectates a mob in Spectator mode, it displays the screen from their perspective. Sometimes it will even provide a screen-rendering effect for particular mobs, such as a green tint for creepers.
However, spectating a mob with a pumpkin on its head does not show the overlay.
How to Reproduce:
Execute the following command: </summon zombie ~ ~ ~ {CanPickUpLoot:True}> (or just build a snowman).
Give the zombie a carved pumpkin and wait for it to pick it up.
Go into Spectator Mode.
Right-click on the zombie.
No pumpkin overlay is shown.
Please see MC-110971.
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