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Hello!
I was making full afk script with item seller in zao at lizards.
I found out that its not possibole to sell Zaoan legs if i have one of them as my eqment.

Is it bug or only for me?

Check again your script, this bug only happens in otservers because you sell your set in npc, global tibia blocks this selling, you have to remove from your equiped items to sell an item.