also fix enum converter for CivitModelType

Author: mohnjiles

StabilityMatrix.Avalonia/App.axaml.cs

@@ -423,6 +423,7 @@ internal static IServiceCollection ConfigureServices()
         };
         jsonSerializerOptions.Converters.Add(new ObjectToInferredTypesConverter());
         jsonSerializerOptions.Converters.Add(new DefaultUnknownEnumConverter<CivitFileType>());
+        jsonSerializerOptions.Converters.Add(new DefaultUnknownEnumConverter<CivitModelType>());
         jsonSerializerOptions.Converters.Add(
             new JsonStringEnumConverter(JsonNamingPolicy.CamelCase)
         );