No offense meant, but it's rather pointless to make assertions about 5.2 when you don't actually have access to it and the people who do are telling you the opposite. I'm not personally using the beta patch at the moment, but if the issues you mentioned are reported as being fixed, then you should satisfied that PI took the time to fix them and not dubious that they can or will.
But people are stating the opposite in the forum, that 5.2 DIDN'T fix Japan.