The two node sprites a drawn hierarchy link joins.
Each end of a link is a node data item, which keeps the sprite it is drawn
as on node. The overlay measures a network line between these, because
amCharts measures neither the line nor anything it could be read from: the
hierarchy theme turns a link's isMeasured off, so it reports a point and
no size (amcharts5 5.21.4).
The two node sprites a drawn hierarchy link joins.
Each end of a link is a node data item, which keeps the sprite it is drawn as on
node. The overlay measures a network line between these, because amCharts measures neither the line nor anything it could be read from: the hierarchy theme turns a link'sisMeasuredoff, so it reports a point and no size (amcharts5 5.21.4).