Fixed some issues with SettingsDictionary

PluginManager/Others/JsonManager.cs

@@ -41,11 +41,13 @@ public class JsonManager
             text = new MemoryStream(await File.ReadAllBytesAsync(input));
         else
             text = new MemoryStream(Encoding.ASCII.GetBytes(input));
+
         text.Position = 0;
 
         var obj = await JsonSerializer.DeserializeAsync<T>(text);
         await text.FlushAsync();
         text.Close();
+        
         return (obj ?? default)!;
     }
 }