We converted out freestyle jobs to pipeline jobs using "Pipeline script from SCM". The Git branch field for the Jenkinsfile to load cannot expand a property which comes from a property file, which name is entered in "Properties File Path". I can however expand a property entered in "Property Content". The properties file is correct because we successfully used to populate the Git branch field for our previous freestyle jobs.
"Lightweight checkout" checkbox is unchecked.
A related (solved) issue is