Wrong result when call $monent(%.a).utc()

[liguangbo]

When I use the $moment function to process parent fields, there is no issue simple invocation. However, I subsequently call utc() function on $moment result, it returns current time.

I think the test2 should be 2021-01-02T11:00:12.000Z

original data

{
  "createdDate": "2021-01-02T11:00:12Z",
  "a": {
    
  }
}

jsonata

(

    a.(
        $m := $moment(%.createdDate);
        {
            "test": %.createdDate,
            "test1": $moment(%.createdDate),
            "test2": $moment(%.createdDate).utc(),
            "test3": $m.utc()
        }
    )
)

external libary

moment      https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.30.1/moment.min.js

[markmelville]

I couldn't say why, but something about the parent pathing expression as a function argument causes it to evaluate differently. Here's a workaround that captures the value of %.createdDate to a variable first.