Why 'Cannot Reproduce' Often Just Means You and Your User Run Different Builds

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A developer at DEV Community described how they mistakenly announced a shipped feature that was still sitting on an unmerged branch, highlighting a common but underappreciated debugging pitfall. Beyond environment differences like OS or network, there are four distinct points where a developer's build can silently diverge from a user's: an uncommitted or unmerged branch, a merged-but-unreleased build, a released-but-uninstalled update, and an installed-but-not-yet-running version. Browser extensions and installed apps are especially prone to this, since auto-updates follow a schedule and open tabs continue running whatever code they launched with. When a developer cannot reproduce a reported bug, they may simply be testing a build no user has ever run. The author recommends automatically capturing build version, browser version, and server commit in every bug report, and treating that data as mandatory rather than optional.

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