In my first project, I have defined watch paths via railway.json file and it is not working.

tried both ways by adding prefixing the paths with / and still does not seems to work.

In my second project, I have defined watch paths via UI and works as expected.

are you trying to use the new builder?

Yes

the new builder does not support pulling service config from the railway.json file and it also does not support watch paths

Are there any future plans to support watch pattern in new builder?

when / if it goes into GA it will support those things, i dont have an ETA. we recommend you use the legacy builder for now, its much faster now that we use buildkit now

I tied disabling the new builder, but for some reason it gets back on automatically

you likely are enabling it elsewhere

Hmm…. Wdym

like in a railway.toml file

I don’t see any explicit property set for that,

{
  "$schema": "https://railway.app/railway.schema.json",
  "build": {
    "builder": "DOCKERFILE",
    "watchPatterns": [
    // ….
    ],
    "dockerfilePath": "api-v2.prod.Dockerfile",
    "buildEnvironment": "V2"
  },
  "deploy": {
    "runtime": "V2",
    "numReplicas": 1,
    "sleepApplication": false,
    "restartPolicyType": "ON_FAILURE",
    "restartPolicyMaxRetries": 10
  }
}