dollar sign substitution is not working if the .env file is located in a custom path

[KooWeiHao]

In a react project

• An environment file named as .env.uat is located at ./env.
• In the environment file, there's a variable with dollar sign value. Eg: REACT_APP_TEST=${TEST}
• The "start" script is having the following command, "env-cmd -f ./env/.env.uat react-scripts start".
• Run the "start" script as follow, "TEST=HELLO npm run start".
• However, the value shown in the app is "${TEST}", instead of "Hello".