incomplete job output

When a job fails, the end of the output seems truncated:

    $ yum install curl -y
    ERROR: Job failed: exit code 127

If I re-run the same job on the same code / commit manually by pressing “retry”, then the output appears:

    $ yum install curl -y
    /bin/sh: eval: line 84: yum: not found
    ERROR: Job failed: exit code 127

As you can see the second line is the most important: it shows the error message. How to get full output always?