I mean, honestly, how can something like this even ship?
Oh, have you been involved in software development? I am (not Opera dev of course) - and this is relatively minor issue, affecting mostly only visual appearance.
Often much more serious problems (like corrupting data - or like latest W10 update, which sometimes just deletes user documents) slip into releases. Read dilbert comics strips - you will discover many (sad) truths about software development...
As you see problems on GeForce too, then that is for better - we can hope fix sooner