input step in post directive is never prompted within Blue Ocean

Create a declarative pipeline with an input step like this:

post {
  always {
    script {
      def response = input message: 'Do you want to undeploy UAT environment?'
    }
  }
}

In the classic stage view plugin, everything works fine and you are prompted. However, in Blue Ocean you only see that the build is paused and you cannot navigate to the post action and answer the prompt.