@amyegan , we’re running into the same issue.
It seems that the node version needs to be inline with the pnpm version. See pnpm version error. · Issue #6499 · pnpm/pnpm · GitHub
That’s probably the issue… Could vercel respect the version defined in the package.json file?
FWIW: We also have `ENABLE_EXPERIMENTAL_COREPACK` set to 1.