Worked on the filamentphp/filament repository to address a data consistency issue affecting multi-select UI components. Focused on backend development using Laravel and PHP, the work involved implementing a targeted cache invalidation fix to ensure that cached relationships are properly cleared after saving, preventing stale data from persisting in the user interface. Regression tests were added to verify correct BelongsToMany behavior and to ensure that detached rows do not re-attach after saves. The approach included invalidating eager-loaded relations by unsetting them post-write, which improved data integrity, user experience, and maintainability for admin UIs relying on accurate relationship data.