Netlify Next.js router forcing /en to URL path randomly


We have a Next.js (v13) on Netlify, which recently the router for single types seems to not work (resulting in 404) and requires /en to the path.
Here’s an example:

[work] = page
[work/*] = single type

In Next.js, we have locale in config as

i18n: {
locales: [“en”],
defaultLocale: “en”,

This has always been in, and worked fine.
So to help resolve it, we removed the defaultLocale, which then made any single page result in 404.

We know this is a Netlify route issue, as we uploaded the same codebase to Vercel which works fine.

Are you still experiencing this problem? If so can you provide your site.ID