Chapter 10 - warning about missing unique key when enabling `ppr`

[ks4na]

Hello, I followed the steps in nextjs dashboard tutorial - chapter 10 to enable ppr and encountered a warning about missing unique key.

Here is the link to the reproducible CodeSandbox repo

use pnpm run dev to start the project.

when visiting /dashboard, a warning about missing unique key appeared.

then i disabled ppr - no warning :

then i enabled ppr, but removed app/dashboard/(overview)/loading.tsx ( I changed filename to loadingx.tsx ) - no warning :

`

then i updated content of loading.tsx to:

export default function DashBoardLoading() {
  return <p>Loading...</p>;
}

the warning appeared again.

I can't find anything wrong with loading.tsx.