I am confused on something and you seem to be pretty knowledgeable. Does the Catholic Church still stand by Jerome's and Eusebius's historical scholarship regarding the dates of Peter's alleged Bishopric in Rome? According to them it was from 42 to 67 AD --- 25 years. Does the Catholic Church still hold to that Tradition or have they backed away from it?
I do not know if the Catholic Church has "an official position" on the length of Peter's bishopric in Rome, or on the starting and ending years of his bishopric. My hunch is that the Church leans on historical scholarship to determine those dates accurately. What is important for the Church is that he was at Rome and that he was martyred there.
-A8