My project uses corepack, in fact in the package.json the version of pnpm to be used is pinned, i.e:

{
  ‘packageManager’: ‘pnpm@9.0.5+sha256.61bd66913b52012107ec25a6ee4d6a161021ab99e04f6acee3aa.50d0e34b4af9’
}

The environment variable ENABLE_EXPERIMENTAL_COREPACK=1 is set on Vercel.
So far it has always worked, but the last deployment failed because vercel tried to use a different version of pnpm.