Cart update issue | WordPress.org

Hello,
When I have in my cart an item with options, price is ok.
But if I add the same item (by clicking on the +/- button), the new price is not updated with the price with option but with the standard price.
Example : 1 item 30 euros + 20 euros options, total 50 euros ; I increase number about one item, so 2 items, total 80 euros (30+20 and only +30), so 20 euros (the option cost) are missing.
Is it a bug or it’s a normal behavior ?
Thanks

 

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