This explains precisely how I was able to reach Dante’s 9th Circle!
On the weekend I reached Dante’s 9th Circle, I was particularly busy, so I couldn’t really play the game but I did have enough time to log in and periodically check on my Agents and keep track of their missions - especially after I saw the 2nd Circle and was excited to keep going through the circles of Hell!
My character never left London during that time. I had a special AFK point in Ealdwic Station, in fact!
When I did need to log off, I did so only after putting an Agent on a Circle mission, so that the missions would be in progress while I was offline. I did know even back then that the mission completion wouldn’t calculate until I logged back in and I was also worried about losing progress if I logged off before having picked up the next Circle, so that part was 100% intentional on my part.
That meant the chain was never truly interrupted, even if I had no idea that rezoning would break it since I was too busy to actually play the game and leave the zone for any reason. I think at most I had time for some RP, which didn’t require leaving the zone at all.
This also explains why I haven’t been able to get back to Dante’s 9th Circle since. We thought it was far more complicated than it was due to a tricky bug!