@wholf359If it's an issue discussed in the comments, I think it's better to leave it there, but if it's a notation of a typo or a story inconsistency, or even something the author may never have considered before (say, from someone who was active during that period), then I simply PM the author, so they can do whatever they want with the information.
But overall, just like everywhere else, I doubt you're likely to find any consistent opinion among authors, as they/we each do our own things and have our own personal preferences.
Better yet, PM the author (if they've enabled it, of course, as many don't) and ask them what they think? As I'm pretty sure how I started handling reader/author comments as I do.