During April 2025, work centered on enhancing the reliability of parallel processing in the area9innovation/flow9 repository. The primary focus was resolving a concurrency bug in the ParallelXP path, where race conditions could cause a promise to reject multiple times. By introducing an isDoneR guard, the update ensured that each promise would resolve or reject only once, preventing duplicate error handling and inconsistent states under asynchronous execution. This solution leveraged expertise in asynchronous programming, bug fixing, and promise handling, all implemented in OCaml. No new features were added, but the fix improved the robustness of parallel operations within the codebase.