When arriving at the checkout with more than 20 items, the items shown in the purchase summary (top-right items list) may be duplicated. The totalizers and even the API are correct. The scenario doesn't happen on the main list of items (cart step).

• Create a cart with more than 20 items;
• Advance into some checkout setup (profile, shipping, or payment)
• Go back and forth between the checkout and cart pages using the UI buttons;
• The items will be duplicated.

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