pp wa eror

an Angular 10 application with pwa with deployment via firebase hosting. pp wa viral 2022 (1) the application works online. pp no 18 tahun 2021 (2) once the application is launched, I cut the internet and I can continue to browse between the pages (3) once the application is launched, I cut off the internet I refresh the page (F5) and I come across: HTTP ERROR 504