Hello,
I am experiencing a similar issue on my site since last Thursday. My site also uses Next.js (13.5.6), and according to the deploy log, it appears that Next Runtime v5.5.1 is being used.
In my case, several pages on my site fail to display because .next/_next/static/<random hash>/_buildManifest.js returns a 404 Not Found error almost randomly with each build.
Clearing the cache and rebuilding solves the issue for the previously affected pages, but the problem then occurs on other random pages.
Since I have only made minor changes, I contacted the Netlify support team via email yesterday, assuming it might be a problem on Netlify’s end, but I have not yet received a response.
The more people who confirm this issue, the more likely Netlify will investigate it. If anyone else is experiencing this, please share your experience here.