Papal infallibility is not invoked that often. Here’s an example, in section 4 (wherefore…) [0]

In particular papal infallibility was not involved in the Protestants’ complaints, and the response to their complaints (Trent) was a council and again has nothing to do with papal infallibility.

The pope was also an absolute monarch at the time, but protestants didn’t care about that aspect.

0: https://www.vatican.va/content/john-paul-ii/en/apost_letters...