During July 2025, Masahiro Yoshida focused on improving data reliability in the XENONnT/fuse repository by addressing a critical bug in particle interaction classification. Using Python and leveraging skills in data analysis and physics simulation, he corrected the mislabeling of positrons as beta particles within lineage and merge cluster analysis workflows. The solution involved targeted updates to lineage_cluster.py and merge_cluster.py, ensuring electrons and positrons are now accurately distinguished throughout the data pipeline. This work enhanced the accuracy of lineage tracking and cluster merging, reducing downstream analytics errors and demonstrating careful debugging, precise patching, and effective use of Git-based change management.