If you look closely, the MERS textures of the Zombie Nautilus & Nautilus Spawn Eggs are inconsistent with the entities MERS and the other aquatic mob spawn eggs MERS.
Water reflection of the Zombie Nautilus & Nautilus Spawn Eggs are different than the other aquatic spawn eggs: instead of using a roughness blue color for the reflection, they use a mix of metalness and roughness.
Plus, the entities themselves are using the wrong color: instead of using a mix of metalness and roughness for the reflection, they use a roughness blue color. The blue roughness color should only be used for the patches of moss.
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