Well I'm not here to talk about what Johan said, just to point out that threads are closed due to them getting overheated, not because complaining about or questioning mechanics is banned. If people can stay calm while talking about it they are free to do so.
And while something clearly went wrong with testing for Japan, an obvious bug doesn't preclude there having been lots of testing. If, say, someone noticed just before making the patch there was a small error in an event that stopped it from firing and fixed it assuming that a minor thing like that was "safe", but it turned out that that event was one that was vital to the Daimyo annexing the Shogun chain and had been preventing it from firing the whole time QA was testing the game... I have no idea in this specific instance, but I've certainly fixed a few bugs that turned out to cause/reveal much worse bugs that I could not have guessed about before. Games are complex things. I agree it's a dumb thing to let happen, but possibly it's easier than you think for bugs to sneak in.
