Already a month ago on the server russia1 built a spiral near the volcano. No point of control. Did not finish building all the walls. Very convenient to put there scorpions. It still stands. Not really a bug, but probably not correct.
Hello!
That's definitely a bug, finished and unfinished buildings (blueprints) outside the land claim areas should start decaying on the next day and decay within 24 hours completely. Thanks for reporting, we will investigate.
Regards!