https://github.com/aslakknutsen/plugin-arquillian/blob/forge2/src/main/java/org/jboss/forge/arquillian/command/ContainerConfigurationCommand.java#L107

The defaultValue of the containerValue option is never displayed in the input field. If you simply press finish, the plugin 'stores' the correct value. Which would indicate the background Model has the correct value, it's just not displayed.