When opening Minecraft 23w04a via the Minecraft Launcher, armor trims did not appear in game. At the current time of this post, this issue was found on a Windows laptop.
In the photo, you can see that there are no smithing templates in the creative menu and that the version is indeed 23w04a.
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duplicates 1
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We're tracking this issue in MC-256552, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as invalid. Please take a look at the parent ticket (MC-256552) and see if an explanation is provided there in the description of the ticket or in the comments for why this issue is invalid.
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You must enable the 1_20 data pack before world generation.