input+when condition in a declarative pipeline

jenkinsfile.adoc

pipeline {
    agent none

    //other stages

    stage("Stage ok") {
        agent any
           when {
	      expression {
                 return !params.PULL_REQUEST
              }
            steps {
                //this stage is being skipped without problems
            }
    }
    stage("go to production") {
                when {
                   beforeAgent true
                   expression {
                        return !params.PULL_REQUEST
                      }
                }
                input {
                    message "Deploy to production?" //this is being evaluated before when expression
                    ok "Yes"
                }
         agent any
         steps {
         //step commands

This is related to JENKINS-50880