Shopkeepers version: 2.23.1
Spigot version: Current Purpur Version: 1.20.6-2233-0d6766e (MC: 1.20.6)**`

After creating Shopkeeper, I add the player_head item there. This player_head has 20 Protection Enchants.
I make many player_heads like this, but when I put the player_head in Shopkeeper, it cannot be traded or the box is empty.

For example:
player_head - Coin = [Not Trading]
player_head - Coin = [Empty Slot but I Click this and give me the player_head]
These 2 rates occur randomly. Sometimes the slot is empty, sometimes it is not traded

This player_head has 20 Protection Enchants.

Can you try to reproduce your issue with a simpler item, maybe a head item with only one enchant?
And then please provide a give command to create this item, so I can try to reproduce the issue.

player_head - Coin = [Empty Slot but I Click this and give me the player_head]

If you are using ViaVersion, please try without it. Also try without any protocol plugins (e.g. ProtocolLib).

Hello I Try delete protocollib but this is not work
The player_heads already 1 Enchant BUT unbreakble in minecraft attribute

Hello I Try delete protocollib but this is not work The player_heads already 1 Enchant BUT unbreakble in minecraft attribute

Please provide me with a Minecraft give command with which I can create this particular item in order to try to reproduce the issue

/itemedit enchant protectin 20
/itemedit unbreakable

/itemedit enchant protectin 20 /itemedit unbreakable

Which plugin are you using for the /itemedit command? This one? https://www.spigotmc.org/resources/itemedit-1-8-x-1-21-x.40993/

Yep

I cannot reproduce the issue on a Spigot server with the latest plugin version: I created the item as you described, but the trade worked and the result item showed up fine, even after reconnects and restarting the server.
I tried both 1.20.6 and 1.21.3 servers. And I also tried to re-create the item with the command to see if that might produce a different item.

I know that users with ViaVersion reported some issue with the result item not showing in cross-1.20.4 and 1.20.6+ versions. So if you are using any of those ViaX plugins, try without them. Another user suspected Eco being involved in the issue.

If you are not using any of that, my guess would still be that the issue is caused by some incompatibility with one of your other plugins, likely a plugin somehow interfering with item packets sent by the server.

#899