The question answered too confidently can hide the useful uncertainty inside it.

Confident answers close questions that may have been more useful open. Where the honest position is that nobody knows yet, saying so keeps people looking; announcing a firm conclusion sends everyone home. The uncertainty was doing work, marking the place where more thought was needed, and confidence erases the mark.

Practise saying what you know and where it stops. Something like: this part is solid, this part is a guess, and here is what would settle it. People trust that more than certainty, and it leaves the interesting part of the question available to work on.