I believe you will find that this question “always” gets ignored.
Even when someone feigns a response it looks something like this:
Question: “Prove to me from Scripture alone that that Scripture says it is the formally sufficient and only rule of Christian faith.”
Answer: “You prove to me X.” Where “X” is any Catholic teaching.
Somehow the Catholic not being able to “prove” something that they never claimed to be able to “prove” is supposed to “prove” the thing that they themselves cannot “prove” is true.
I guess the logic goes something like this:
If you believe X is true even though you cannot prove it, then you must allow that Y is true because I can’t prove it either.
If this particular logical fallacy doesn’t already have a name, I call dibs!
I dub it the “Chuckism”. Hehe.