Why Fixing One Bug Often Leaves Several More Hidden in Your Codebase

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A software developer at a multi-tenant SaaS company patched a dashboard bug where a status widget returned empty results for certain users, only to discover days later that the same flaw existed in multiple other query handlers. The root cause was a missing single line of code — a null append to a warehouse ID list — that ensured unassigned orders were included in query results. Because the original handler had been copy-pasted five times as new widgets were added, the omission propagated inconsistently, leaving three of six handlers broken. The bugs in the other handlers had gone unreported, likely because fewer users encountered them or silently assumed the missing data was expected. The developer's key takeaway is that fixing a bug should prompt engineers to identify the broader pattern being violated, not just patch the single visible instance.

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