title: Worker node doesn't trigger Jenkins job in queue even when available
body: <p>This question could seem similar to other questions but I tried everything and nothing worked for me that's why I'm asking specific question for my case.</p>
  
  <p>I am running Jenkins jobs using Pull request builder in a master - worker system. I have 2 worker with 2 executors each. Master doesn't have any executor. I have 2 freestyle jobs A and B. My plan is to run job A and B concurrently (whenever PR is open/modified) in a worker node but I cannot run my job A/B concurrently in a node. Currently, by default, my job A is tied to one worker node and job B is tied to another worker node. All other jobs are in queue which delays my test execution. </p>
  
  <p>I looked around for different plugins - Node and Label parameters, distributed builds, job restrictions. I tried labelling the jobs and node but jobs didn't trigger. So, not sure what's the problem as I don't see any errors in logs may be I'm not using plugins in a proper way. Can someone please let me know what is the good way of the dealing my situation?</p>