I’ve never seen GW results reversed due to a bug. If I’m wrong, I’d love to know when and how it happened.
I feel like, historically, this is the kind of “oversight” that, if acknowledged at all by the devs, will be brushed aside as “a bug, but we’re not going to fix it”. I don’t care to even discuss whether I think that’s right or not. It is how it’s going to be because it’s how it has always been. I have seen pages and pages of discussion about how unfair people feel it is.
This is why while i like competing in GW, it is not the most important part of “me having fun” in GoW. It happens once every 3 weeks, and I’m just as likely to lose 1500 points to Goblins getting lucky as I am to lose to something like “unexpected block storm”. I used to get really angry about it. Then I realized the only thing I got out of that was angry.
If you absolutely must have competitive integrity, this is really the wrong game for you. The only thing that might cause that to become more important is a severe exodus of competitive players. But it’s just as likely they’ll just get replaced by whoever was 2nd-place to their power and more willing to deal with shaky integrity of events. Sunken cost is a powerful master.