Owning a project is counter-productive for QA. If it’s your project, you know where to click and where to not click.
OTOH, you don’t need to know anything about a project to conclude that a crash with access violation, or hang with 100% CPU usage, are clearly bugs.
Of course anyone can make a mistake. Maybe you prefer the 'discussions' route because it's only seemingly then possible for a projects own devs to make a mistake in creating an issue.