Haven't been playing for that long, but I think its fairly obvious when a game developer doesn't care about the minority. This bug was out before the release of Shadowkeep and it will remain long after. They are not looking into it, they are only releasing the stock standard updates that they need to keep new potential people buying.
To be honest what you said makes no sense think about it even if you are new and know the constantly shifting meta there is no way you would know about a issue with a gun without somebody telling you about it and the game is free to play now so they aren't losing money that way and no one is buying forsaken just for izanagi.