I can’t speak for all developers, but personally I’d rather have a bug report that isn’t actually a bug, but rather a user error over nothing at all. Because that means that my expectation of how others might use a feature could be incorrect which is a bug to me - just not a programmatic bug.
Some developers may of course not be as of appreciative of it, but I’d say so long as you have a cursory look at their issue tracker and no one else has reported it, then I’d say its worth it.