The ruling on counting the extra fifth rak'ah for the late-joining follower

Question:
The questioner says: Honorable Shaykh, may Allah grant you success, if the follower misses a rak'ah, and the imam adds a fifth rak'ah, for example in a four-rak'ah prayer, does that suffice for him, and he prays one rak'ah, and the extra one is dropped?

Answer:
This is a matter of scholarly disagreement among the scholars: does one count the extra rak'ah or not? The school of thought that will come to us, if Allah wills, is that it is not counted, because it is not considered valid for the imam, so it is not considered valid for the follower. This is the well-known position in the school. The second opinion is that it is permissible to count it, because it is permissible for the imam, but it does not become permissible for the one being worshipped, so it is counted. This is the opinion of my teacher, Shaykh 'Abd al-Rahman al-Sha'iri (may Allah have mercy on him), in his collection of fatwas. But the first opinion is more cautious. The first opinion is more cautious. Yes.