Flaky playwright test: tests/playwright/shiny/components/MarkdownStream/basic/test_stream_basic.py (webkit, firefox)

[schloerke]

Summary

tests/playwright/shiny/components/MarkdownStream/basic/test_stream_basic.py:46 is flaking on non-Chromium browsers during the v1.6.2 release CI.

Observed failures

PR #2248 (release: v1.6.2) — run 26245264517:

• playwright-shiny (3.11, webkit, 3) — job 77241834568
• playwright-shiny (3.12, firefox, 2)

This is the second release cycle in a row where the same MarkdownStream test has failed on webkit / firefox.

Notes

• All Chromium runs pass on every Python version.
• The non-Chromium failures appear to be timing-related (suggest checking expectations around the streaming animation in test_stream_basic.py:46).
• Not blocking the v1.6.2 release — proceeding past the failure since the broader matrix is green.

cc @karangattu — please take a look.