Reload PM2 configuration file

I have problems with reloading PM2 configuration file after editing it:

{
    "apps": [
        ...
        {
            "name": "foo",
            "script": "foo/index.js",
            "cwd": "foo",
            "watch": false
        }
    ]
}

I previously did

pm2 restart config.json

and

pm2 reload config.json

and

pm2 gracefulReload config.json

but they didn't reload the configuration for existing apps (the changes in app config did not apply). The only way that worked for me was:

pm2 delete foo
pm2 restart config.json

How is this supposed to be done?

via estus