vercel build breaks with latest version complaining about corepack/yarn mismatch

[Quicksaver]

Describe the bug

A Nextjs app, with a route rendering the NextStudio component from next-sanity/studio, fails to build in vercel. Running yarn next build works fine, but running vercel build (which will eventually run yarn next build) fails with the following message:

Detected Next.js version: 15.2.1
Running "yarn build:production"
error This project's package.json defines "packageManager": "[email protected]". However the current global version of Yarn is 1.22.22.

Presence of the "packageManager" field indicates that the project is meant to be used with Corepack, a tool included by default with all official Node.js distributions starting from 16.9 and 14.19.
Corepack must currently be enabled by running corepack enable in your terminal. For more information, check out https://yarnpkg.com/corepack.
Error: Command "yarn build:production" exited with 1

To Reproduce

Expected behavior

Build should continue as it always has before.

Screenshots

Which versions of Sanity are you using?

sanity 3.78.1 fails
sanity 3.78.0 works

What operating system are you using?

Which versions of Node.js / npm are you running?

npm v10.9.2
node v22.14.0 (corepack enabled)
yarn 4.6.0

Additional context

Security issue?

No

[laamdev]

Same thing is happening to me.