After pushing a change to my Svelte + Bun project today, Railway's build failed while the same build succeeds locally with Node 22.18.0.

What happened:

• Railway automatically installed Node 25.2.1 and the build failed

• Locally with Node 22.18.0: build succeeds

• Locally with Node 25.2.1: build fails (confirming it's a version issue)

What I tried:

1. Set RAILPACK_NODE_VERSION=22.18.0 environment variable → build still failed

2. Added "engines": { "node": "22.18.0" } to package.json → build still failed

3. Added mise.toml file → build finally succeeded

Expected behavior:
Either the RAILPACK_NODE_VERSION environment variable or the engines.node field in package.json should have pinned the Node version to 22.18.0, but neither worked.

Workaround:
Using mise.toml works, but it seems like the other standard methods should have worked first.