Fix being able to pull multiple entities at once (#2398)

Content.Shared/GameObjects/Components/Pulling/SharedPullableComponent.cs

@@ -118,12 +118,20 @@ namespace Content.Shared.GameObjects.Components.Pulling
 
         public bool TogglePull(IEntity puller)
         {
-            if (Puller == null)
+            if (BeingPulled)
             {
+                if (Puller == puller)
+                {
+                    return TryStopPull();
+                }
+                else
+                {
+                    TryStopPull();
                     return TryStartPull(puller);
                 }
+            }
 
-            return TryStopPull();
+            return TryStartPull(puller);
         }
 
         public bool TryMoveTo(EntityCoordinates to)

Content.Shared/GameObjects/EntitySystems/SharedPullingSystem.cs

@@ -41,6 +41,12 @@ namespace Content.Shared.GameObjects.EntitySystems
 
         private void OnPullStarted(PullStartedMessage message)
         {
+            if (_pullers.TryGetValue(message.Puller.Owner, out var pulled) &&
+                pulled.TryGetComponent(out SharedPullableComponent? pulledComponent))
+            {
+                pulledComponent.TryStopPull();
+            }
+
             SetPuller(message.Puller.Owner, message.Pulled.Owner);
         }