Does the COPYARTIFACT_BUILD_NUMBER_SUFFIX work on expected lines in workflow/pipeline jobs? copy artifact command am using is

step([$class: 'CopyArtifact', filter: '*.rpm', fingerprintArtifacts: true, projectName: 'test_pkg', resultVariableSuffix: 'testsuffix', selector: [$class: 'ParameterizedBuildSelector', parameterName: 'testparam'], target: 'test_packages'])

when i do

println COPYARTIFACT_BUILD_NUMBER_TESTSUFFIX

am getting the below error

groovy.lang.MissingPropertyException: No such property: COPYARTIFACT_BUILD_NUMBER_TESTSUFFIX for class: WorkflowScript

println env.COPYARTIFACT_BUILD_NUMBER_TESTSUFFIX gives me null