Thank you for your reply.
After I created this post we actually managed a workaround, almost by accident. We catched the "deselect" event by using the error handler event. See image, we get "error: CustomEvent", and inside the detail: Object we get a message saying "Could not serialize a data point."
Anyways, it would be very good with a detailed documentation update. As developers we spend a lot of time with trial and error.