The mace is a 2d item, while the trident is a 3d item. many people already made a 3d model of the mace, so why not make it standard 3d, so the mace sticks more out then the others.
MC-271571
Suggestion for the mace
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This is (maybe) a feature request (especially because of the word 'suggestion' in the title). If so, you can suggest this change on https://feedback.minecraft.net.