push-in of Roo-generated converter methods in ApplicationConversionServiceFactoryBean doesn't move method to java source

When I push in a converter method from the Roogenerated ApplicationConversionServiceFactoryBean_Roo_ConversionService.aj with "Refactor -> Push-in" command the methods are not moved to the Java source file. My expectations were they were going to be moved, just like when I push-in other methods.

I'm not sure this is so by design or from a mistake.