On a technical level, this kind of cache update is necessary, but on the user experience level there is a clear difference between "let's see if you fail to rea

On a technical level, this kind of cache update is necessary, but on the user experience level there is a clear difference between "let's see if you fail to read carefully and confirm the sale at an increased price" and explicitly apologizing for failing to respect the old price and stopping the checkout to ask for extra confirmation.