Item drops from iron golems and cats aren't affected by looting enchantment. Here's the list of mob drops without looting enchantment
Iron Golem drops 3-5 iron ingot and 0-2 poppies
Cat drops 0-2 string
Steps to Reproduce:
Make sure to enchant your sword with Looting 3, using /enchant @s looting 3
Summon Iron golem and cats
Kill it using the sword enchanted with looting and observe the loot that it drops upon death
Observed Results:
Killing Cat doesn't increase string drops
Killing Iron Golem doesn't increase Iron Ingot and Poppy drops
Expected Results:
Both cat and iron golem drops would be affected by the looting enchantment.
Code Analysis:
Code analysis by @unknown can be found in this comment.
Linked issues
relates to 1
Attachments
Comments 4

Duplicate of MCPE-35307 I think. If not its related.
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This is not a duplicate of MCPE-35307. This occurs because iron_golem.json and cat.json are missing the "looting_enchant" function.