I have the same issue.

Or you using turbopack, like that for dev : next dev --turbopack ? I tried without and the 'error' disappeared.

And of course I've awaited my params like that for exemple :

export default async function Blog({
  params,
}: Readonly<{
  params: Promise<{ lang: Locale }>;
}>) {
  const { lang } = await params;

I haven't found any issue on github about this, I'll think about opening one.