This is what Dr. Feser, a catholic philosopher and teacher says:
Some people think that Catholic teaching is that a pope is infallible not only when making ex cathedra declarations, but in everything he does and says. That is also simply not the case. Catholic doctrine allows that popes can make grave mistakes, even mistakes that touch on doctrinal matters in certain ways.
Papal teaching, then, including exercises of the extraordinary Magisterium, cannot contradict Scripture, Tradition, or previous binding papal teaching. Nor can it introduce utter novelties. Popes have authority only to preserve and interpret what they have received. They can draw out the implications of previous teaching or clarify it where it is ambiguous. They can make formally binding what was already informally taught. But they cannot reverse past teaching and they cannot make up new doctrines out of whole cloth.
edwardfeser.blogspot.ca/2015/11/papal-fallibility.html
I have another thread going in spirituality - “can catholic teaching be changed?”
forums.catholic-questions.org/showthread.php?t=1063429
