Worked on the kestra-io/kestra repository to enhance the reliability of scheduled executions by addressing a bug in the handling of MULTISELECT input defaults within the Schedule trigger. Refactored the TriggerService using Java and the Spring Framework to ensure that default and provided values for multiselect parameters are correctly processed and validated during scheduled runs. Applied test-driven development practices, adding comprehensive unit tests to cover the new logic and prevent regressions. This targeted fix improved parameter integrity and execution stability, contributing to the overall robustness of backend workflows without introducing new features during the development period.