Not all regions are served with the same scripts. That’s why the ad-block pop-up was shown for some users but not for others or at a later time for others. This also affected the update cycle of those anti-adblock scripts.

The reason for that is quite simple. New stuff is rolled out to only some users at first as some sort of beta testing procedure. If many people complain about functionality issues and all of those have the new version of the script, Google knows there is something wrong with it.