@Benjamin *****
No. I am on an extension of stay in a non-B. My paperwork for the extension went through fine in Sept. -- passport stamped with the extension and a paper receipt of paid extension, but the info didn't go in the system. When I saw that, I rushed the next day to immigration who apologized and even said they remembered me (small office) and know I extended. Luckily, all was taken care of in less than a minute. I have seen other people on here say they noticed that error, too, when they couldn't do 90 days per usual.