Ported to 1.20.5:

• Map trades caching will prioritize the item_name over the custom_name if both components are present.
• Placeholder trades now display an emerald on each sides, since Minecraft no longer supports empty trades. (The change is purely cosmetic, placeholders still cannot be used.)

Upgrading an older world to 1.20.5

No particular actions should be required, but the upgrade process is partially handled by the mod, please make backups and report any oddities you may find.

The mod needs to upgrade exploration maps from the trade caches. Potential issues to look out for are: trade maps loosing their content, their name, or not being stackable with previously sold maps.

If a villager had an empty placeholder trade, Minecraft will simply delete that trade. This shouldn't cause any long term issue; the villager's trade list will naturally fix itself upon rerolling.