When drawing a list of polylines, only the first line is displayed on the map, the rest are colourless, maxLines = 2130903480 is a large number, it is less than 1000 lines. The coordinates are correct. The same result is obtained with Xamarin.GooglePlayServices.Maps
Polyline pline;
for (int i = 0; i < cadL[j].ln.Count; i++) // List of line
{
pline = new Polyline();
pline.Geopath.Clear();
pline.StrokeColor = Color.Blue;
pline.StrokeWidth = 4;
for (int k = 0; k < cadL[j].ln[i].l.Count; k++) // List of vertex
{
//pline.Positions.Add(new Position(cadL[j].ln[i].l[k].x, cadL[j].ln[i].l[k].y));
pline.Geopath.Add(new Position(cadL[j].ln[i].l[k].x, cadL[j].ln[i].l[k].y));
}
customMap.MapElements.Add(pline);
//customMap.CustomPLines.Add(pline);
}