Worked on the pypeit/PypeIt repository to improve the reliability of GMOS tilted-slit data reduction workflows. Addressed a specific bug in the mask definition handling for Gemini GMOS observations, which previously caused errors during processing of tilted-slit configurations. The solution involved targeted updates to the reduction pipeline and thorough validation to ensure stability for affected datasets. Release notes were updated using reStructuredText (rst) to document the fix and guide users. Focused on documentation and workflow validation, this work reduced potential processing errors and enhanced user confidence in the pipeline, leveraging skills in documentation and data reduction for astronomical instrumentation.