After a very unpopular change last month which removed many monuments from maps smaller than 3500, the team has reverted some of the change. Large monuments have been added back to small maps (launch site and excavator still require at least 3500 world size). This will not take effect until the next map wipe (Sept. 5th), but should have things on small maps back to the way they used to be. 

Information Source rustafied.com