That’s really not a productive view point on the matter. There’s nothing to say that the bug hasn’t been reported, either.
Each iteration of the game likely goes through rigorous internal testing and QA. Despite this, bugs still happen. It’s a natural consequence of software engineering, especially when the software is so large in scope and complexity.
Bugs should be put into the right pipelines, regardless of how or why or when they are caught.
I’m certain that Blizzard has their own internal issue tracker where they triage, prioritize, and link bugs.
Closing a bug a Duplicate, Invalid, or Out of Scope is always better than not addressing it in the first place.
Either way, this has become entirely tangential to the initial question.