Other effects and permissions may still enable this Unit to be able to be played to the selected location, but Ambush’s permission will not be valid
§ 822.3.a Core Rules PDF (officieel)
§ 822 Ambush
§ 822.3 If there are no units at the location chosen before Finalization completes for any reason, then it is no longer a valid location by Ambush’s reasoning and cannot be played there
