unable to find class for annotation @Field in jenkins pipeline script from scm

I'm encountering an issue with my pipeline script when running it from SCM. The @Field annotation isn't being recognized, even though I'm using the correct import statement (import groovy.transform.Field). This only happens when running the pipeline from SCM; it works fine when the script is executed directly in Jenkins (version 2.203.3). Does anyone have any suggestions on how to resolve this?

This is an example of a segment of my code :

import groovy.transform.Field

@Field def FINAL_SELECTED_RULES = []
@Field def FULL_VERSION = "1.0.0.0"
@Field def SERVICE_PARAMS = [
        'TestService1',
        'TestService2',
        .....
]
pipeline {
    agent { label '' }
    environment {
        GIT_URL = ""
        SERVICE_NAME = ""
        ARTIFACTORY_SOURCE = ''
        DEPLOY_DIR = "${env.WORKSPACE}\\Deploy"
        ZIP_FILE = "${DEPLOY_DIR}\\${SERVICE_NAME}.zip"
        DEV_SERVER_DIR = ""
    }

    options {
        timeout(time: 1, unit: 'HOURS')
        buildDiscarder(logRotator(numToKeepStr: '10'))
        disableConcurrentBuilds()
        skipStagesAfterUnstable()
    }

    parameters {
        string(name: 'JENKINS_SLAVE', defaultValue: '', description: 'Slave build server')
        booleanParam(name: 'TestService', defaultValue: false, description: '')
    }

    stages {
        stage('Prepare') {
            steps {
                cleanWs()
                git url: "${GIT_URL}", credentialsId: 'test'
            }
        }

        stage('Retrieve Version Info from Artifactory') {
            steps {
                script {
                    echo "Retrieving version info from Artifactory"
                    FINAL_SELECTED_RULES = getSelectedRules()
                    FINAL_SELECTED_RULES.each { rule ->
                        echo "Processing rule: ${rule.name}"
                        def currentVersion = getVersionFromArtifactory(rule.name+"Rules")
                        rule.version = incrementVersion(currentVersion)
                        echo "Rule: ${rule.name}, Current Version: ${currentVersion}, New Version: ${rule.version}"
                    }
                    echo "Final selected rules with versions: ${FINAL_SELECTED_RULES}"
                }
            }
        }
    }
}


def getSelectedRules() {
    SERVICE_PARAMS.findAll { paramName -> params[paramName] }
            .collect { paramName -> [name: paramName, version: null] }
}

def getSelectedRulesEnv() {
    SERVICE_PARAMS.collect { paramName ->
        [
                param: paramName,
                dir  : paramName,
                envId: "${paramName}"
        ]
    }
}


def incrementVersion(version) {
    def parts = version.split('\\.')
    parts[-1] = (parts[-1].toInteger() + 1).toString() 
    return parts.join('.')
}