fix potential cancelaltion on updateshareddata

MareSynchronos/Services/CharaData/CharaDataNearbyManager.cs

@@ -28,6 +28,7 @@ public sealed class CharaDataNearbyManager : DisposableMediatorSubscriberBase
     private Task? _filterEntriesRunningTask;
     private (Guid VfxId, PoseEntryExtended Pose)? _hoveredVfx = null;
     private DateTime _lastExecutionTime = DateTime.UtcNow;
+    private SemaphoreSlim _sharedDataUpdateSemaphore = new(1, 1);
     public CharaDataNearbyManager(ILogger<CharaDataNearbyManager> logger, MareMediator mediator,
         DalamudUtilService dalamudUtilService, VfxSpawnManager vfxSpawnManager,
         ServerConfigurationManager serverConfigurationManager,
@@ -49,6 +50,9 @@ public sealed class CharaDataNearbyManager : DisposableMediatorSubscriberBase
     public string UserNoteFilter { get; set; } = string.Empty;
 
     public void UpdateSharedData(Dictionary<string, CharaDataMetaInfoExtendedDto?> newData)
+    {
+        _sharedDataUpdateSemaphore.Wait();
+        try
         {
             _metaInfoCache.Clear();
             foreach (var kvp in newData)
@@ -63,6 +67,11 @@ public sealed class CharaDataNearbyManager : DisposableMediatorSubscriberBase
                 list.Add(kvp.Value);
             }
         }
+        finally
+        {
+            _sharedDataUpdateSemaphore.Release();
+        }
+    }
 
     internal void SetHoveredVfx(PoseEntryExtended? hoveredPose)
     {