فإن ظنَّ ذلك يُفسِدُ صومَه، فأكلَ بعدَ ذلك مُتعمِّدًا: فعليه القضاءُ، ولا كفارةَ عليه.
Translation: If he supposes the prior act has invalidated his fast and then eats deliberately, he owes make-up, but not expiation.
The special case is sequential: a person first eats through forgetfulness, mistakenly believes this has already nullified the fast, and then deliberately eats again. Quduri requires qaḍāʾ but not kaffārah in that specific case.
It must not be converted into a general permission to break a fast deliberately. The mistaken belief following the initial forgetful act is an essential part of the case.