When using triple-single-quoted strings, I can access PROJECT_NAME, BUILD_NUMBER and BUILD_STATUS using the following:

```$PROJECT_NAME - $BUILD_NUMBER: $BUILD_STATUS```

When trying to do the same in triple-double-quotes:

"""${env.PROJECT_NAME} - ${env.BUILD_NUMBER}: ${env.BUILD_STATUS}"""  

I get "null" for PROJECT_NAME and BUILD_STATUS but BUILD_NUMBER is fine.

I tried other methods:

"""'${PROJECT_NAME}' - '${BUILD_NUMBER}': '${BUILD_STATUS}'"""
and
"""$PROJECT_NAME - $BUILD_NUMBER: $BUILD_STATUS"""

Those both return an error:

No such property: PROJECT_NAME for class: groovy.lang.Binding