Jenkins Git plugin is not expanding environement variables - jenkins

Question

I'm trying to set up a Jenkins job to verify my pull requests with Bitbucket Push and Pull request plugin.
The branch and commit get correctly detected but when fetching sources Jenkins git plugin fails to expand the environment variable set in the branches-to-build` field.
The documentation states clearly that an environment variable could be used to specify the branch name or pattern.
Bitbucket push and pull request plugin already provides a variable the pull request branch.
BITBUCKET_SOURCE_BRANCH
Source branch - only for pull requests (BB Cloud and BB Server).
Here is the Error that i get when i push my commit. You can see that the commit is correctly detected but the environment variable is not expanded or resolved.
hudson.plugins.git.GitException: Command "/usr/bin/git fetch --tags --force --progress --prune -- origin +refs/heads/${BITBUCKET_SOURCE_BRANCH}:refs/remotes/origin/${BITBUCKET_SOURCE_BRANCH}" returned status code 128:
stdout:
stderr: fatal: couldn't find remote ref refs/heads/${BITBUCKET_SOURCE_BRANCH}
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:2681)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandWithCredentials(CliGitAPIImpl.java:2102)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.access$500(CliGitAPIImpl.java:86)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$1.execute(CliGitAPIImpl.java:624)
at jenkins.plugins.git.GitSCMFileSystem$BuilderImpl.build(GitSCMFileSystem.java:366)
at jenkins.scm.api.SCMFileSystem.of(SCMFileSystem.java:197)
at jenkins.scm.api.SCMFileSystem.of(SCMFileSystem.java:173)
at org.jenkinsci.plugins.workflow.multibranch.ReadTrustedStep$Execution.run(ReadTrustedStep.java:101)
at org.jenkinsci.plugins.workflow.multibranch.ReadTrustedStep$Execution.run(ReadTrustedStep.java:82)
at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1$1.call(AbstractSynchronousNonBlockingStepExecution.java:47)
at hudson.security.ACL.impersonate2(ACL.java:449)
at hudson.security.ACL.impersonate(ACL.java:461)
at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1.run(AbstractSynchronousNonBlockingStepExecution.java:44)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)
Finished: FAILURE
I tried with ${GIT_BRANCH} as well but got the same issue.
Any help is really appreciated. Thank you

Answer 1

You need to have in Branch Specifier:
origin/${BITBUCKET_SOURCE_BRANCH}