October 2025: Interactivity API improvements across WordPress core and the development repository delivered stronger hydration, safer client-side module loading, and parity between server-side directives and client behavior. Key changes include lazy-loaded derived state props during SSR, load-on-client-navigation, and unique IDs in server-side directive processing, all contributing to more reliable rendering and smoother user interactions. A stability improvement was completed by excluding the experimental full-page interactivity script from the WordPress Core bundle, reducing risk in production. These changes, combined with improved parsing and error handling in interactivity flows, enhanced developer experience and overall product resilience, while maintaining broad compatibility with existing extensions.