Pushin refactoring of Controller methods fails with Exception in Roo Shell

I created a simple project with one entity "Foo" and one field.

Then I scaffolded the controller with controller all.

Now, I did 'push-in-refactoring' for the "update" method of the controller.

The Roo shell gives following exception then:

[Spring Roo Process Manager Background Polling Thread] Method 'update' already defined in target type 'de.controllerpushintest.web.Foo
Controller' (ITD target 'de.controllerpushintest.web.FooController_Roo_Controller')

java.lang.IllegalArgumentException: Method 'update' already defined in target type de.controllerpushintest.web.FooController' (ITD target 'de.controllerpushintest.web.FooController_Roo_Controller')

at org.springframework.roo.support.util.Assert.isNull(Assert.java:89)
at org.springframework.roo.classpath.details.ItdTypeDetailsBuilder.onAddMethod(ItdTypeDetailsBuilder.java:84)
at org.springframework.roo.classpath.details.AbstractMemberHoldingTypeDetailsBuilder.addMethod(AbstractMemberHoldingTypeDetailsBuilder.java:138)
at org.springframework.roo.classpath.details.AbstractMemberHoldingTypeDetailsBuilder.addMethod(AbstractMemberHoldingTypeDetailsBuilder.java:156)
at org.springframework.roo.addon.web.mvc.controller.scaffold.mvc.WebScaffoldMetadata.<init>(WebScaffoldMetadata.java:105)

...

Afterwards, the Roo shell seems not to react on changes applied to the controller at all.

It's critical, since one cannot customize controllers anymore.