Configurator.lookup() in JCasc plugin returns null for java.util.concurrent.TimeUnit which is an Enum class.

Using configuration-as-code plugin to find a configurator of step (Jenkins pipeline steps) class using Configurator configurator = Configurator.lookup(clazz) (clazz represent class of jenkins pipeline step) and then using Object stepObject = configurator.configure(mapping) to configure stepObject (link: https://github.com/gautamabhishek46/simple-pull-request-job-plugin/blob/7a647b0cd81c88867043e4cecf40404ffd67c431/src/main/java/io/jenkins/plugins/sprp/PipelineSnippetGenerator.java#L297).
I found that Configurator.lookup() method returns a null for class java.util.concurrent.TimeUnit which is a Enum.