When I run this JavaScript code in Visual Studio Code, some console.log() operations work but some don’t

I am working on a JavaScript objects exercise for a course I’m following, but when I run the code I don’t get the expected result. I’ve cut the code down to the essentials for clarity.

const myObject = {
    _array: [ 
        {item: 'a', item2: 'b', item3: 'c'},
        {item: 'd', item2: 'e', item3: 'f'},
        {item: 'g', item2: 'h', item3: 'i'}
        ],

    get items () {
        return this._array;
    },

    addThing (newItem1, newItem2, newItem3) {
        let thing = {
            item1: newItem1,
            item2: newItem2,
            item3: newItem3
        };
        /* `this.players.push(player);` is adding a new player object to the `_players` array of the `team` object. It uses the `push()` method to add the `player` object to the array. */
        this._array.push(thing);
      }

}
console.log('hello before');
myObject.addThing('j', 'k', 'l');
console.log(myObject._array);
console.log('hello after');

Running this from a terminal window gives me the expected result where the array is dumped …

… but running it with F5 or Run and Debug gives me this

I’d like to understand why there is no output of _array when run this way.