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Maurice
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After a server upgrade the app wrote the new version into its marker before the service worker had fetched the new build. When that fetch failed, when the new precache broke off halfway, or when the browser had already swapped workers before the version check answered, the page kept the old bundle, and every later launch took the marker at its word and never tried again. An installed PWA went on showing the previous UI. The marker now moves only once the handover is done or turned out to be unnecessary, so a failed attempt is simply retried on the next launch. A failure no longer reloads into the shell the old worker serves again, a worker that took over before the check answered still gets its reload, and no path reloads more than once per version and session. Caches and workers are still never deleted.