After upgrading the Git plugin version 4.1.1 to the latest version 4.2.2, following exception is being thrown during a clone:

java.lang.IllegalArgumentException: Git repository URL 2 is an empty string in job definition. Checkout requires a valid repository URL

In earlier versions below git configuration was working fine:

checkout(scm: [$class: 'GitSCM', userRemoteConfigs: [[url: "${gitURL}"], [name: "origin"]], branches: [[name: "${gitTag}"]]])

Above snippet is taken from a Jenkins Shared Library groovy script.
Rolling back to git version 4.1.1 works fine. Let me know if you need more information.