Interpretation of verses by the sages

A. In Taanit 52, the Gemara makes it difficult to write
And it came to pass, when Samuel was old, that he made his sons judges over Israel.
After all, he died at the age of 52, and the excuse is that old age has overtaken him because he asked that Saul continue to reign even though David's time had come, and the excuse does not fit the verses, since the verse about Samuel's old age speaks before Saul was appointed king (Kushit Maharsha)
B. In the well-known mishna Yadayim 44, Rabbi Yehoshua wants to allow an Ammonite immigrant to come in the congregation because Sennacherib came and confused all the nations, and Rabban Gamliel claims to forbid the return of the Ammonites from the verse of Vashabti (Yeremiah 44), and they have already returned.
And apparently both sides ignore the fact that the prophecy about the Ammonites, at the end of which is the above verse, was spoken long after Sennacherib, and if so, he did not come and confuse the Ammonites (although there is not so much NM about them themselves because there is this prophecy, but a. The Mishnah also cites Sennacherib regarding the Ammonites b. It is necessary to discuss whether this is considered a bad prophecy that is not certain to come true according to Chazal c. NM for other nations)
What's interesting about these examples is that even if we say that the wicked can make mistakes and that they used this ability (the Jews of the Hereafter and the Messiah), it's still very strange because these are simple mistakes that we wouldn't expect a wise person to make. It seems more like there's some principled move here that… I don't know.