Revert "Update submodule to 172.0.0 (#21222)" (#21225)

Content.Client/CharacterInfo/CharacterInfoSystem.cs

@@ -1,5 +1,6 @@
 using Content.Shared.CharacterInfo;
 using Content.Shared.Objectives;
+using Robust.Client.GameObjects;
 using Robust.Client.Player;
 using Robust.Client.UserInterface;
 
@@ -10,11 +11,14 @@ public sealed class CharacterInfoSystem : EntitySystem
     [Dependency] private readonly IPlayerManager _players = default!;
 
     public event Action<CharacterData>? OnCharacterUpdate;
+    public event Action? OnCharacterDetached;
 
     public override void Initialize()
     {
         base.Initialize();
 
+        SubscribeLocalEvent<PlayerAttachSysMessage>(OnPlayerAttached);
+
         SubscribeNetworkEvent<CharacterInfoEvent>(OnCharacterInfoEvent);
     }
 
@@ -29,6 +33,14 @@ public sealed class CharacterInfoSystem : EntitySystem
         RaiseNetworkEvent(new RequestCharacterInfoEvent(GetNetEntity(entity.Value)));
     }
 
+    private void OnPlayerAttached(PlayerAttachSysMessage msg)
+    {
+        if (msg.AttachedEntity == default)
+        {
+            OnCharacterDetached?.Invoke();
+        }
+    }
+
     private void OnCharacterInfoEvent(CharacterInfoEvent msg, EntitySessionEventArgs args)
     {
         var entity = GetEntity(msg.NetEntity);