Using same Jenkinsfile for jenkins piepline and jenkins multi-branch project returns different values for branch name property for result of `checkout scm` command.

I am trying to extract branch name without remote name. e.g. dev and not origin/dev

script {

scmVars = checkout scm

echo "scmVars: ${scmVars}"

}

For jenkins multibranch pipeline project I am getting exepected value:

scmVars: [*GIT_BRANCH:dev*, GIT_COMMIT:32f5748fb219621babebcf680040578aa5cd8a20, GIT_PREVIOUS_COMMIT:3c83fcf5c404b37ebde858de5d2194ea9cc0c06d, GIT_PREVIOUS_SUCCESSFUL_COMMIT:3c83fcf5c404b37ebde858de5d2194ea9cc0c06d, GIT_URL:http://myproject]

For jenkins pipeline project I am getting:

scmVars: GIT_BRANCH:origin/dev, GIT_COMMIT:32f5748fb219621babebcf680040578aa5cd8a20, GIT_PREVIOUS_COMMIT:32f5748fb219621babebcf680040578aa5cd8a20, GIT_PREVIOUS_SUCCESSFUL_COMMIT:1a9cf9e3c15055bb70d72fc1670759f48e88ddde, GIT_URL:[http://myproj.com]/]

.