Git plugin , stash pull request

I'm using pull request notification from stash , After upgrading the jenkins git plugin to latest version this part of configuration , doesn't work anymore:

now is taking the ${PULL_REQUEST_TO_BRANCH} variable literally , is not replaced for the name's branch to merge. It was working with git plugin 3.0.1 version , after upgraded it , it doesnt work.  

jenkins log:

 
Merging Revision 1bcff39a1e0803df273897b13bda222e3c8d30b7 (origin/devops-config-files) to origin/$PULL_REQUEST_TO_BRANCH, UserMergeOptions{mergeRemote='origin', mergeTarget='$PULL_REQUEST_TO_BRANCH', mergeStrategy='default', fastForwardMode='--ff'}
> git rev-parse "origin/$PULL_REQUEST_TO_BRANCH^{commit}" # timeout=10
FATAL: Command "git rev-parse "origin/$PULL_REQUEST_TO_BRANCH^{commit}"" returned status code 128:
 

before upgrading it was working

 
Merging Revision 3a20f51209059e8044303292a813f1aacffcfd21 (origin/Fixgradle) to origin/secondary_branch, UserMergeOptions{mergeRemote='origin', mergeTarget='$PULL_REQUEST_TO_BRANCH', mergeStrategy='default', fastForwardMode='--ff'}
> git rev-parse origin/secondary_branch^{commit} # timeout=10