The difference between one agent and the next is not usually in the job definition, it is in the content of the workspace on the agent. If the commit is found on one agent and not found on another, then the commit is available on one agent and not available on the other. The history of builds on the agent are the most likely cause why one agent is "lucky" and includes the commit and another agent is "unlucky" and does not include the commit.
Check that your job definition showing the failure is operating on a branch or tag that contains the commit that is being referenced. If it does not, then the job definition needs to be corrected.