title: Jenkins multi-branch pipeline missing a branch
body: <p>I have a Jenkins system.  It runs build jobs for our company. We run multibranch pipelines. Yesterday one of the builds mysteriously dropped the devel branch from the build.</p>
  
  <p>I looked through the Pull Requests for the branch and I can not find anything that affected by the Jenkins file in the time frame where this branch drop occurred.</p>
  
  <p>I have looked through the Jenkins system log and I do not see any errors. Here is a copy of the relevant parts of the scan repository log:</p>
  
  <pre><code>Examining Bo**a/pro-***-ter
  
    Checking branches...
  
    Getting remote branches...
  
      Checking branch devel
  
    Getting remote pull requests...
  
      Checking branch master
        ‘Jenkinsfile’ found
      Met criteria
  </code></pre>
  
  <p>I have validated that the devel branch has a Jenkinsfile and that the Jenkinsfile is valid.</p>
  
  <p>I can't figure out how to solve this.  Any suggestions would be great.</p>
  
  <p>Some plugin information:</p>
  
  <ul>
  <li>github 1.28.0</li>
  <li>branch 2.0.11</li>
  <li>docker-common 1.13</li>
  <li>docker-pipeline 1.17</li>
  <li>git 3.6.0</li>
  <li>git client 2.7.0</li>
  <li>git server 1.7</li>
  <li>SCM API 2.2.3</li>
  </ul>
  
  <p>Jenkins version 2.73.2</p>