tether-gun fixes (#19658)

- Just remove container tethering entirely.

Content.Shared/Weapons/Misc/SharedTetherGunSystem.cs

@@ -45,10 +45,26 @@ public abstract partial class SharedTetherGunSystem : EntitySystem
 
         SubscribeLocalEvent<TetheredComponent, BuckleAttemptEvent>(OnTetheredBuckleAttempt);
         SubscribeLocalEvent<TetheredComponent, UpdateCanMoveEvent>(OnTetheredUpdateCanMove);
+        SubscribeLocalEvent<TetheredComponent, EntGotInsertedIntoContainerMessage>(OnTetheredContainerInserted);
 
         InitializeForce();
     }
 
+    private void OnTetheredContainerInserted(EntityUid uid, TetheredComponent component, EntGotInsertedIntoContainerMessage args)
+    {
+        if (TryComp<TetherGunComponent>(component.Tetherer, out var tetherGun))
+        {
+            StopTether(component.Tetherer, tetherGun);
+            return;
+        }
+
+        if (TryComp<ForceGunComponent>(component.Tetherer, out var forceGun))
+        {
+            StopTether(component.Tetherer, forceGun);
+            return;
+        }
+    }
+
     private void OnTetheredBuckleAttempt(EntityUid uid, TetheredComponent component, ref BuckleAttemptEvent args)
     {
         args.Cancelled = true;
@@ -152,7 +168,8 @@ public abstract partial class SharedTetherGunSystem : EntitySystem
         if (HasComp<TetheredComponent>(target) || !TryComp<PhysicsComponent>(target, out var physics))
             return false;
 
-        if (physics.BodyType == BodyType.Static && !component.CanUnanchor)
+        if (physics.BodyType == BodyType.Static && !component.CanUnanchor ||
+            _container.IsEntityInContainer(target))
             return false;
 
         if (physics.Mass > component.MassLimit)