changedSelection event subject always null

@turnert wrote:

I added a changeSelection handle to my diagram:

private registerEvents() {
    this.diagram.addDiagramListener("ChangedSelection", (event) => this.onSelectionChanged(event));
}

private onSelectionChanged(event: go.DiagramEvent) {
    console.log("Subject:", event.subject);
}

event.subject is always null, no matter what I select or deselect. I expected this to be the same iterable as diagram.selection (which does work properly).

Am I wrong to expect this?

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