The PreCommit Flink Container job is flaky

[github-actions]

The PreCommit Flink Container is failing over 50% of the time.
Please visit https://github.com/apache/beam/actions/workflows/beam_PreCommit_Flink_Container.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=11&var-Workflow=PreCommit%20Flink%20Container

[damccorm]

@liferoad is looking at this

[damccorm]

Should be fixed by #33219 - we can monitor the signal and close

[liferoad]

Yes, let us keep this open for now. I want to monitor how stable it is.

[github-actions]

Reopening since the workflow is still flaky

[kennknowles]

Perma-red for a few days.

[kennknowles]

Looks like a type error (caught at runtime)