[Failing Test]: A few failed tests for TestStream with keyed elements

[shunping]

What happened?

See https://github.com/apache/beam/actions/runs/19908135517/job/57069740859?pr=36983

• ParDoTest$BundleFinalizationTests. testBundleFinalizationWithState
• ParDoTest$StateTests. testMapStateNoReadOnComputeIfAbsentAndPutIfAbsentInsertsElement
• ParDoTest$TimerTests. testOutputTimestamp
• ParDoTest$TimerTests. testOutputTimestampWithProcessingTime

Issue Failure

Failure: Test is flaky

Issue Priority

Priority: 1 (unhealthy code / failing or flaky postcommit so we cannot be sure the product is healthy)

Issue Components

• [ ] Component: Python SDK
• [ ] Component: Java SDK
• [ ] Component: Go SDK
• [ ] Component: Typescript SDK
• [ ] Component: IO connector
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