Developer discovers his own proposed bug fix had already shipped — real flaw lay elsewhere

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A developer filed a critical bug report against safari-mcp, his own open-source tool that allows AI agents to control a Safari browser session, after a user's tabs were navigated without consent. He traced the issue to positional tab tracking and proposed switching to a stable identity-based system using a sentinel marker. When he opened the code to implement the fix, he found he had already built and shipped that exact solution three months earlier in version 2.8.3. The real bug turned out to be four lines below the existing fix: a 'ghost index' clamping line that could reassign the agent's active tab index to a live user tab when the tab count changed. The incident highlighted how confident architectural reasoning from memory, without reading the actual code, can produce a plausible but entirely incorrect root cause.

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