Don't copy null actions on the client (#10324)

Content.Shared/Actions/ActionTypes/InstantAction.cs

@@ -26,10 +26,13 @@ public class InstantAction : ActionType
     {
         base.CopyFrom(objectToClone);
 
+        // Server doesn't serialize events to us.
+        // As such we don't want them to bulldoze any events we may have gotten locally.
         if (objectToClone is not InstantAction toClone)
             return;
 
         // Events should be re-usable, and shouldn't be modified during prediction.
+        if (toClone.Event != null)
             Event = toClone.Event;
     }
 

Content.Shared/Actions/ActionTypes/TargetedAction.cs

@@ -104,6 +104,7 @@ public class EntityTargetAction : TargetedAction
         Whitelist = toClone.Whitelist;
 
         // Events should be re-usable, and shouldn't be modified during prediction.
+        if (toClone.Event != null)
             Event = toClone.Event;
     }
 
@@ -141,6 +142,7 @@ public class WorldTargetAction : TargetedAction
             return;
 
         // Events should be re-usable, and shouldn't be modified during prediction.
+        if (toClone.Event != null)
             Event = toClone.Event;
     }