It wouldn't let me put the version under 21w06b, and that's the version I saw this in, this may be in 21w08b though, but the drowned only has one armor layer, if that makes any sense. As you can see in the images, the boots in picture be are on the same layer as the pants. It may be because the Drowned's skin has the regular layer and overlay layer. Thanks for reading this 
Steps to reproduce:
1) Run this command:
/summon minecraft:drowned ~ ~ ~ {NoAI:1,ArmorItems:[{Count:1,id:golden_boots},{Count:1,id:golden_leggings},{Count:1,id:golden_chestplate},{Count:1,id:golden_helmet}]}
2) Also run this command
/summon minecraft:zombie ~ ~ ~ {NoAI:1,ArmorItems:[{Count:1,id:golden_boots},{Count:1,id:golden_leggings},{Count:1,id:golden_chestplate},{Count:1,id:golden_helmet}]}
3) Compare the two
- is duplicated by
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MC-222095 Drowned Armour model is wrong
- Resolved
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- Resolved
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- Resolved
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- Resolved
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- Resolved