Can't Expand Object that Extends EventTarget

I have a js class that extends EventTarget to take advantage of js's built in event handling, but when I view an instance of that item in the component inspector it just says EventTarget and I'm unable to expand it or interact with it in anyway. Is there a way to get this to retain that functionality while extending that class?

class Dialog extends EventTarget {
    // ...
}

class DialogService {

    /**
     * Internal reference to the existing dialogs
     */
    public readonly instanceMap: Map<string, Dialog>;

    constructor() {
        this.instanceMap = reactive(new Map());
    }

    add(dialog: Dialog) {
        this.instanceMap.set(dialog.id, dialog);
        dialog.addEventListener('transitioned', () => this.remove(dialog);
    }

    // ...
}

Reproduce the issue in the component inspector with the TypeScript Dialog class extending EventTarget and the reactive instanceMap shown in the report. Start at the component inspector's object rendering and inspect how EventTarget instances are handled. Done means the Dialog instance can be expanded and interacted with instead of appearing only as EventTarget.