Incremental migration to app router and internationalization

[plush galleon]

I am trying to migrate my app to app router.
When trying to implement the approach described in https://nextjs.org/docs/app/building-your-application/routing/internationalization
I found that it only works if next.config.js doesn't contain i18n settings.
But if you remove these settings, then i18n for old pages stops working.
How can I solve this situation so that I can migrate some pages to the app router with i18n without breaking old pages?

[civic vessel]

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[paper turtle]

following because I have encountered the same and would love to know if there's an answer.