Branch names starting with "origin/" cannot checkout in certain cases

[smirkybg]

Jenkins and plugins versions report

Environment

Jenkins: 2.319.3
Bitbucket Branch Source Plugin: 751.vda_24678a_f781

What Operating System are you using (both controller, and any agents involved in the problem)?

Controller OS: N/A Agent OS: Ubuntu Bionic

Reproduction steps

1. Create a Jenkinsfile with an explicit Checkout stage and call checkout scm in it.
2. Add another explicit Checkout stage and call

checkout([
  $class: 'GitSCM',
  branches: scm.branches,
  doGenerateSubmoduleConfigurations: false,
  extensions: [
      [$class: 'SubmoduleOption',
          disableSubmodules: false,
          parentCredentials: true,
          recursiveSubmodules: true,
      ],
      [$class: 'GitLFSPull']
  ],
  submoduleCfg: [],
  userRemoteConfigs: scm.userRemoteConfigs
])

3. Create a branch and name it with an origin/ prefix like origin/branch_name.
4. Commit the above example, which should trigger a pipeline with your new branch.

Expected Results

1. A pipeline should be triggered.
2. The default checkout should fetch the Jenkinsfile.
3. The explicit checkout scm step should checkout the default project SCM configuration in the Multibranch config
4. The additional explicit checkout, which I use to checkout the git submodules should inherit the default checkout settings and override only the submodule settings.

Actual Results

1. OK
2. OK
3. OK
4. Fails to checkout:

Warning: JENKINS-30600: special launcher org.jenkinsci.plugins.docker.workflow.WithContainerStep$Decorator$1@b97fe27; decorates RemoteLauncher[hudson.remoting.Channel@324be2ed:JNLP4-connect connection from 10.255.0.5/10.255.0.5:57932] will be ignored (a typical symptom is the Git executable not being run inside a designated container)
Cloning the remote Git repository
Cloning repository ssh://git@BITBUCKET_SERVER:7999/NAMESPACE/PROJECT.git
 > /usr/bin/git init /var/jenkins/workspace/in_origin_feature_ignore-this-pr # timeout=10
Fetching upstream changes from ssh://git@BITBUCKET_SERVER:7999/NAMESPACE/PROJECT.git
 > /usr/bin/git --version # timeout=10
 > git --version # 'git version 2.17.1'
using GIT_SSH to set credentials ivs1hi ssh private key
 > /usr/bin/git fetch --tags --progress -- ssh://git@BITBUCKET_SERVER:7999/NAMESPACE/PROJECT.git +refs/heads/*:refs/remotes/origin/* # timeout=10
Avoid second fetch
 > /usr/bin/git config remote.origin.url ssh://git@BITBUCKET_SERVER:7999/NAMESPACE/PROJECT.git # timeout=10
 > /usr/bin/git config --add remote.origin.fetch +refs/heads/*:refs/remotes/origin/* # timeout=10
 > /usr/bin/git rev-parse refs/remotes/origin/feature/ignore-this-pr^{commit} # timeout=10
 > /usr/bin/git rev-parse origin/feature/ignore-this-pr^{commit} # timeout=10
Couldn't find any revision to build. Verify the repository and branch configuration for this job.

Anything else?

If the branch name doesn't start with origin/, this issue doesn't happen and the checkout with the submodules succeeds. I didn't find any relevant options that could handle this case, which is why I'm assuming that this is a bug/corner case and I thought to report it here.