Only run the FieldToPropertyPass after the user passes and the fields state can change.

src/Generator/Driver.cs

@@ -137,6 +137,7 @@ namespace CppSharp
 
             Generator.SetupPasses();
 
+            TranslationUnitPasses.AddPass(new FieldToPropertyPass());
             TranslationUnitPasses.AddPass(new CleanInvalidDeclNamesPass());
             TranslationUnitPasses.AddPass(new CheckIgnoredDeclsPass());
             TranslationUnitPasses.AddPass(new CheckFlagEnumsPass());