This is an announcement for everyone that in the coming months we will be changing how the city decay / deletion process will work. Likely in about a months time we will turn on the warnings to follow the new guidelines how this will work and likely a month after that we will change the actual deletion.
The new rule will be that you need a completed facility to stop the decay from happening. No longer will paused construction stop this decay from occurring. Announcements will be made as we reach each stage of this new process.
So if you have construction that is paused and it is keeping a city from decaying I suggest to finish it off while you can, assuming you have access.