وَيَنْقُضُ الْمَسْحَ مَا يَنْقُضُ الْوُضُوءَ، وَيَنْقُضُهُ أَيْضًا نَزْعُ الْخُفِّ، وَمُضِيُّ الْمُدَّةِ. فَإِذَا مَضَتِ الْمُدَّةُ نَزَعَ خُفَّيْهِ، وَغَسَلَ رِجْلَيْهِ، وَصَلَّى، وَلَيْسَ عَلَيْهِ إِعَادَةُ بَقِيَّةِ الْوُضُوءِ.
Meaning: What nullifies wudu also invalidates wiping. Removing the khuff and expiry of the permitted period also end the concession. After the time expires, remove the khuffs, wash the feet, and pray; the remaining parts of wudu need not be repeated.
A new minor impurity nullifies wudu and requires a new wudu. But the ending of wiping permission through expiry or removal, while the rest of wudu remains intact, has a more limited consequence in the Hanafi framework: wash the feet without repeating the rest.
Confusing these two kinds of invalidation leads to incorrect answers.