Has anyone encountered IO conflicts after correction by custodian?

With the assistance of Fireworks, I ran VASP structure optimization jobs on a PBS cluster. Once a job corrected by custodian, I got an OSZICAR in a strange format, which is usually caused by IO conflicts I think.

However, such problems would not happen when running without custodian. That’s why I post the topic here. I wonder if there is anyone encountered similar problems.