In order to stop the event jamming fake-attacks that plague endgame, the headquarters have decided to do a quick fix against it while developers design proper countermeasures to stop the servers from overloading.
The quick fix is that all attacks against Wonder of the World villages determined to be fakes, will be cancelled by the server automatically. Therefore, do not be puzzled if your fake attacks you sent against WWs return back on their own. Same applies to the scouts!
UPDATE: the headquarters have extended the anti-jam protection so that now also small reinforcements are sent back to their senders. This only considers T4 worlds, T4.2 worlds do not have this jamming issue.