plugin versions are attached as screenshot

Hrm, I can't reproduce this running the following:

pipeline {
    agent any
    parameters {
        booleanParam(name: 'RUN_TESTS', defaultValue: false, description: 'Do you want to run the build with tests?')
    }
    stages {
        stage('foo') {
            steps {
                script {
                    if (params.RUN_TESTS) {
                        echo "true: ${params.RUN_TESTS}"
                    }
                    else echo "false: ${params.RUN_TESTS}"
                }            
            }
        }
    }
}

mm I could reproduce when hitting on REPLAY (as opposite of starting a new build). Can it make any difference? I can do some more tests

Ok I can reproduce it in this way.

• create the pipeline job and set the default to true.
• hit on REPLAY but in the script section, modify the default to false
• execute

Aaaaah, ok, I think I know what's happening here. When you replay the build with job parameter definitions already in place, that results in the run actually having those parameters as part of it - so params.RUN_TESTS in the replayed build isn't getting the default value as it is in the first build, it's getting the actual value of the parameter RUN_TESTS. And that actual value is true, since that was the default value for RUN_TESTS when the build started.

yeah makes sense but it's not ideal. Is there something we can do or you think it's a non-defect? It makes testing harder