I'm not sure why, but for some reason, when I paste my arena in a zone in the air, my pasted building disappears after a restart; is this a zoning issue or a copy-paste issue? The zone flags are no decay true, stability false, safezone true.  I paste it with stability and autoheight false, and at a specified position.
I have no errors and no decay while the 12-hour server cycle persists, yet it is wiped when the restart process happens.