MigrationContext.TryGetValue - value asserted as not null when returning possibly true

Author: ColinBradley

src/Orleans.Core/Lifecycle/MigrationContext.cs

@@ -107,7 +107,7 @@ public bool TryGetValue<T>(string key, [NotNullWhen(true)] out T? value)
             var reader = Reader.Create(source, session);
             var field = reader.ReadFieldHeader();
             value = codec.ReadValue(ref reader, field);
-            return true;
+            return value is not null;
         }
 
         value = default;