A note pointed out by al-Hafiz al-Dhahabi regarding the hasan hadith, which is his statement

The Shaykh : This is also found in "al-Taqrib," where he may weaken a narrator in one book and authenticate him in another. This arises from the difference in the scholar's independent legal reasoning.
There is another point worth mentioning, which al-Hafiz al-Dhahabi pointed out, and I have not found anyone else who has pointed it out. It is a specific note regarding the hasan hadith. Imam al-Nawawi says in his treatise, which was recently printed and which I was very pleased with, but I do not know if... the text; because the copy of "al-Muqni'a" available in the Dar al-Kutub al-Zahiriyyah is the one from which I benefited with this point I will recite to you, but I was disappointed because there is a missing section in the middle of the treatise. I do not know if some of you read the printed version to me, and mentioned that he pointed out the missing section in the Dar al-Kutub al-Zahiriyyah copy, and that he supplied this missing part from other copies, or printed it from the Zahiriyyah copy as it was, with its defects and all. The point is that he says in this valuable treatise—which is on the terminology of hadith: "Judging a hadith as hasan is one of the most subtle types of hadith sciences." Because the scholar is often perplexed regarding a class of narrators: are these among those whose hadiths are graded hasan or weak? He says—and from what remains in my memory—that a single researcher may sometimes grade a hadith as hasan and sometimes as weak. This is indeed a reality. Why? Because when a person wants to grade a hadith as hasan, he must recall the biography of the narrator about whom the scholars' opinions have varied and become confused. He is either recalling the scholars' opinions or not. He reviews a book, for example, "Tahdhib al-Tahdhib" by al-Hafiz Ibn Hajar, and finds there much contradiction among the hadith scholars regarding this biographical subject. In this situation, he must summarize these many words in a single word. Sometimes this word indicates that the narrator is in the middle, so his hadith is in the rank of hasan. Sometimes it says he is weak, which is what predominates in his study of these opinions. From here, the researcher's ruling on a single hadith becomes unstable; he may grade it hasan at one time and weak at another. I was very pleased with this, because I used to feel this issue in my own heart and in my experience, which is more than half a century long. When I found this note from this Imam and learned that my feeling of this problem was the same feeling that Imam had, this is why it benefits you to remember this fact, and let the matter not be difficult for you; because the matter is so subtle that a single researcher may differ in his opinion on a single hadith because of a single narrator about whom there is disagreement.
Yes.