The mace cannot be found in minecraft creative mode nor can the ingredients be found either. Some players might wanna check it out without having to go through the trial chamber.
Update: The problem has been fixed, just head over to data packs and add the 3 data packs.
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@@unknown, that screenshot looks like 1.20.4, based on the menu background. The mace is only available in the 1.20.5 snapshots.
Did your make your world with the 1.21 experiment enabled? This needs to be enabled for experimental items to show up.