Qwen 3.8 Flash chose a size but never got the shoes into the cart

Every step

1. 0:06StoreClicked “Aero Run 2 Light running shoes for everyday roa…”“I see the homepage with featured products. I'll click on the Aero Run 2 to open its product page as a typical in-stock product.”
2. 0:12Product pageClicked “Choose a size”“I'm on the product page and need to select a required size before adding to cart. I'll click the size selector to open the options.”
3. 0:17Size chosenPicked “42”“The size dropdown is open showing in-stock options 42 and 43. I'll select size 42 to satisfy the required variant.”
4. 0:22Size chosenClicked “Choose a size 40 – out of stock 41 – out of sto…”“The size control is a custom listbox, so the select action failed. The dropdown is open and I can see size 42 as an available option, so I'll click on the 42 option inside element [11].”
5. 0:27Size chosenClicked “Choose a size”“The size selector still shows 'Choose a size', so the previous click did not register a selection. I'll click the dropdown again to open it and pick a size.”
6. 0:35Size chosenClicked “Choose a size 40 – out of stock 41 – out of sto…”“The size dropdown is open and I can see '42' as an available option. I'll click on it to select size 42.”