The PostCommit Python Nexmark Direct job is flaky

The PostCommit Python Nexmark Direct is failing over 50% of the time.
Please visit https://github.com/apache/beam/actions/workflows/beam_PostCommit_Python_Nexmark_Direct.yml?query=is%3Afailure+branch%3Amaster to see all failed workflow runs.
See also Grafana statistics: http://metrics.beam.apache.org/d/CTYdoxP4z/ga-post-commits-status?orgId=1&viewPanel=7&var-Workflow=PostCommit%20Python%20Nexmark%20Direct

Start by reviewing the failed runs in the PostCommit Python Nexmark Direct GitHub Actions workflow linked in the issue, then compare them with the Grafana post-commit statistics. Identify the recurring failure pattern and trace it to the relevant Nexmark Direct job entry point. Done means the workflow completes reliably across repeated post-commit runs.

Written by the indexing model from the issue text.