During March 2026, Jiashun Luo worked on the key4hep/k4geo repository, focusing on stabilizing calorimeter geometry for detector simulations. He addressed a subtle 49 nm overlap between layer 10 and the active volume by adjusting layer thickness within the XML configuration, ensuring accurate geometry representation. Using C++ and XML, Jiashun also implemented diagnostic output to report discrepancies between planeLength and layerTotalHeight, providing early detection of potential overlaps. This targeted bug fix, co-authored with a collaborator, improved measurement integrity and reduced systematic error in calorimeter simulations. The work emphasized maintenance and reliability, with no new features delivered during this period.