How a Deprecated Rule Silently Resurfaced and Why It Went Unnoticed

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A developer who manages personal decision-making through small versioned files discovered a flaw in their system when a deprecated rule reappeared undetected. The original rule rejected any reviewer-panel output scoring below 70% internal consistency, but was replaced after low-scoring responses proved to contain genuinely valuable, unconventional insights. About a week later, while writing an unrelated rule about app-growth diagnosis, the author independently reasoned their way back to the same discredited 70% threshold and embedded it as a standalone condition. Because the new rule was self-contained rather than referencing the superseded one, the versioning system had no way to flag the contradiction. The incident highlights a structural gap in knowledge management: deprecation only works if copies of the old logic are caught, not just the original file.

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