Errata and supplement to Technical Report v1. 10 and v1. 12. Technical Report v1. 12 corrected the Failure Fingerprint statistics (muₛtat, sigmaₛtat, and their deviation coordinates) for Upscayl Standard and SwinIR against an independent, join-free verification database, and explicitly deferred Upscayl High-Fidelity and Digital-Art to a later report. This report completes that remaining work for all four models studied in this series, re-deriving every value under the identical exact-methodology-matched procedure. Result: Upscayl Standard's sigmaₛtat is corrected from 0. 0800 to 0. 101 (confirming Technical Report v1. 12) ; SwinIR is confirmed fully unaffected on both axes; Digital-Art is confirmed fully unaffected on both axes despite a 54. 1% reduction in its underlying population count; Upscayl High-Fidelity is severely affected on both axes -- muₛtat corrected from 0. 1400 to 0. 0100, with the deviation coordinate collapsing from roughly 19x the theoretical constant to essentially on it, and sigmaₛtat corrected from 0. 0800 to 0. 0860. No two models show the identical impact pattern, confirming the bug's consequences are model-specific rather than a single fixable constant. As a secondary, independent cross-check, the SSIM=1. 0 Pixel Identity transitivity corollary (every comp_* feature matching exactly between GT, noTTA, and TTA on blocks where both reconstructions score SSIM=1. 0) is confirmed with zero exceptions across all four models, at population sizes ranging from 15 (High-Fidelity) to 2, 657, 100 (SwinIR). Along the way, a numerical coincidence between High-Fidelity's and SwinIR's corrected muₛtat values is investigated directly and resolved as a boundary-condition artifact of the split algorithm's own lower bound, not a genuine cross-model connection -- documented explicitly to prevent later mis-citation. Together, these results are framed as demonstrating two things at once: that the original join-based database construction carries real, model-specific risk rather than a single isolated defect, and that the new join-free pipeline is a validated correction, not merely a theoretical one -- alongside a reusable five-step procedure for trusting, or correctly distrusting, any aggregate statistic built on a join-based or estimator-based pipeline. Upscayl Standard's and SwinIR's databases are identical to those already independently verified and evidenced in Technical Report v1. 12 and v1. 12. 1; this report cites that existing evidence directly and provides fresh hashes and screen-recorded video evidence only for Upscayl High-Fidelity and Digital-Art, new to this report. Dataset and Mandatory Citation: - Source: NIH ChestX-ray8 (Hospital-scale chest x-ray database) - Citation: Wang, X. , Peng, Y. , Lu, L. , Lu, Z. , Bagheri, M. , & Summers, R. M. (2017). "ChestX-ray8: Hospital-scale chest x-ray database and benchmarks on weakly-supervised classification and localization of common thoracic diseases. " Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition (CVPR), 3462–3471. - Download: https: //nihcc. app. box. com/v/ChestXray-NIHCC Contact: s. shiny. n. works@gmail. com
neco mohumohu (2026) studied this question.