{"record":{"id":"fc3877c7845337ad","repo":"Fission-AI/OpenSpec","slug":"the-active-delta-for-proposed-update-id-chang","errorCode":null,"errorMessage":"The active delta for '${proposed.update.id}' changed during the fallback copy.","messagePattern":"The active delta for '(.+?)' changed during the fallback copy\\.","errorType":"exception","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"src/core/archive.ts","lineNumber":1963,"sourceCode":"                );\n                if (\n                  (await fingerprintPortableContent(archivedSource)) !==\n                  proposed.sourceContentFingerprint\n                ) {\n                  throw new Error(\n                    `The archived delta for '${proposed.update.id}' changed during the final move.`\n                  );\n                }\n                if (stagedSource) {\n                  const stagedDelta = path.join(\n                    stagedSource,\n                    path.relative(changeDir, proposed.update.source)\n                  );\n                  if (\n                    (await fingerprintPortableContent(stagedDelta)) !==\n                    proposed.sourceContentFingerprint\n                  ) {\n                    throw new Error(\n                      `The active delta for '${proposed.update.id}' changed during the fallback copy.`\n                    );\n                  }\n                }\n              }\n            };\n            await moveDirectory(changeDir, archivePath, {\n              verifyCopiedDestination: verifyArchivedDeltas,\n            });\n            changeArchived = true;\n            await verifyArchivedDeltas();\n            await finalizeRetirementBackups(specSnapshots, mainSpecsDir);\n          } catch (error) {\n            if (error instanceof MoveDestinationRetainedError) {\n              changeArchived = true;\n              try {\n                await finalizeRetirementBackups(specSnapshots, mainSpecsDir);\n              } catch (cleanupError) {","sourceCodeStart":1945,"sourceCodeEnd":1981,"githubUrl":"https://github.com/Fission-AI/OpenSpec/blob/6926ccb18afa4ff621112813e9968334576ee11a/src/core/archive.ts#L1945-L1981","documentation":"Error \"The active delta for '${proposed.update.id}' changed during the fallback copy.\" thrown in Fission-AI/OpenSpec.","triggerScenarios":"Thrown at src/core/archive.ts:1963 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"6926ccb18afa4ff621112813e9968334576ee11a","analyzedAt":"2026-08-25T12:29:45.729Z","schemaVersion":2},"datasetVersion":"2026-08-25T16:17:27.014Z"}