RadzenSeriesDataLabels Visible=false not working?

Hi,
My RadzenChart has a RadzenLineSeries that contains:
<RadzenSeriesDataLabels Visible="false" />
but the labels still appear. I have also tried
<RadzenSeriesDataLabels Visible=false /> (no quotes), but no change.

Any advice?
Thanks
Matt

It seems to work as expected in our online demo. Please compare your declaration with the demo source.