Only ready lifecycle callback fires in Polymer 2

When I create a Polymer 2.0 element, only the ready lifecycle callback seems to fire, and I can't work out why. For example, I have this Polymer element:

<link rel="import" href="../../bower_components/polymer/polymer-element.html">

<dom-module id="flip-four-board">
    <script>
        class FlipFourBoard extends Polymer.Element {            

            static get is() { return "flip-four-board"; }

            created() {
                super.created();
                console.log("created");
            }

            ready() {
                super.ready();
                console.log("ready");
            }

            attached() {
                super.attached();
                console.log("attached");
            }

            detached() {
                super.detached();
                console.log("detached");
            }

        }

        customElements.define(FlipFourBoard.is, FlipFourBoard);
    </script>

</dom-module>

But when I insert it into a page like this:

<!DOCTYPE html>
<html>
<head>
    <title>Flip Four Board Tests</title>
    <script src="../../../bower_components/webcomponentsjs/webcomponents-lite.js"></script>
    <link rel="import" href="../../../bower_components/polymer/polymer.html">
    <link rel="import" href="../flip-four-board.html">
    <style type="text/css">
        html, body {
            width: 95%;
            height: 95%;
        }
    </style>
</head>
<body>
    <flip-four-board></flip-four-board>
</body>
</html>

The console only reads:

Why is only the ready callback firing?

1.x (legacy) | 2.x ----------------------|----------------------------- created | constructor attached | connectedCallback detached | disconnectedCallback attributeChanged | attributeChangedCallback ready | ready

class FlipFourBoard extends Polymer.Element { static get is() { return "flip-four-board"; } constructor() { super(); console.log("created"); } ready() { super.ready(); console.log("ready"); } connectedCallback() { super.connectedCallback(); console.log("attached"); } disconnectedCallback() { super.disconnectedCallback(); console.log("detached"); } }

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