The Bug:

You cannot eat golden apples while looking at zombie villagers.

It's important to note that you were able to do this in 1.15.2, but since the release of 1.16, it is not possible anymore. This is probably caused by the ability to cure zombie villagers using golden apples.

Steps to Reproduce:

1. Obtain a golden apple and summon a zombie villager by using the command provided below.

   /summon minecraft:zombie_villager ~ ~ ~ {NoAI:1b,ArmorItems:[{},{},{},{id:"minecraft:iron_helmet",Count:1b}]}

2. Attempt to eat the golden apple while looking at the zombie villager.
3. Take note as to whether or not you can eat golden apples while looking at zombie villagers.

Observed Behavior:

You cannot eat golden apples.

Expected Behavior:

You would be able to eat golden apples.