For now we can only speculate what regressed this. FWIW I don't think it's related to Bug 1936770, I rather suspect Bug 2005558 (which modified the same file as Bug 1985997, which I suspect is responsible for the first mentioned Playwright test starting to permafail, but it already had one failure before that patch). It landed on 2026-02-12.
Bug 2032066 Comment 8 Edit History
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For now we can only speculate what regressed this. FWIW I don't think it's related to Bug 1936770, I rather suspect Bug 2005558 (which modified the same file as Bug 1985997, which I suspect is responsible for the first mentioned Playwright test starting to permafail, but it already had one failure before that patch). Bug 2005558 landed on 2026-02-12.