Fix desync wrt off-map flights

game/theater/controlpoint.py

@@ -646,6 +646,10 @@ class ControlPoint(MissionTarget, SidcDescribable, ABC):
         """
         return False
 
+    @property
+    def is_offmap(self) -> bool:
+        return False
+
     @property
     def moveable(self) -> bool:
         """
@@ -1578,6 +1582,10 @@ class OffMapSpawn(ControlPoint):
     def status(self) -> ControlPointStatus:
         return ControlPointStatus.Functional
 
+    @property
+    def is_offmap(self) -> bool:
+        return True
+
 
 class Fob(ControlPoint, RadioFrequencyContainer, CTLD):
     def __init__(