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When we download the label and packing slip in ZPL format, there is always an issue with the packing slip, as it contains duplicate items, how to solve the problem?

When we download the label and packing slip in ZPL format, there is always an issue with the packing slip, as it contains duplicate items, how to solve the problem?

I am trying to link Shipstation in Magento 2.4.2, and set "ShipStation Api Key", Shipstation also prompts that the link is successful, but the order is not synchronized, Magento prompts: "The ShipStation Shipping Rates plugin has been installed but n...