This thread is trying to answer question "How can I merge independent run reports from playwright tests into one html file?"
You can also merge multiple test runs together by using the official merger: https://playwright.dev/docs/test-sharding#merge-reports-cli
If its not working, I recommend to elaborate or file an issue with repro steps.
Try to use blob reporter https://playwright.dev/docs/test-reporters#blob-reporter. I am not sure if it is possible to merge html reports
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