I don't think, except for a direct regression, it's even possible to define a bug in a way that isn't the same as a feature request. They're identical: someone wants the software to do X, it doesn't do X, maybe we should make it do X. (Except, again, for it used to do X but now doesn't and that wasn't intentional.)

Treating bugs as different than features and automatically pushing them to the front of the line likely leads to a non-parsimonious expenditure of effort and sets up some nasty fights with other parts of the company which will definitely figure out that something being a "bug" gets it prioritized. Obviously this can be done poorly, and why even have engineers if you aren't listening to their prioritization as well.