the patch notes for snapshot 23w04a claims to introduce armor trims, templates and smithing table changes, and does not whatsoever.
Linked issues
duplicates 1
Comments 2
You need to enable the experimental data packs upon world generation.
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We're tracking this issue in MC-256552, so this ticket is being resolved and linked as a duplicate.
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When you create the world, you have to press "datapcks" and activate them