Can't change Node version... need 23 stuck at 18

Question

this is my railway.toml file
```[build]
builder = "nixpacks"
buildCommand = "bun install && bun run build"

[deploy]
startCommand = "bun run start"
healthcheckPath = "http://localhost:3000/api/health"
healthcheckTimeout = 100
restartPolicyType = "on_failure"

[deploy.envs]
NODE_ENV = "production"
NIXPACKS_NODE_VERSION = 23
```
I've tried setting another env with the same name. Didn't work. I also have engine.node configured in my package.json.