SketchEditor igonre when already exists vertex, mostly when 2 vertex are close

[Dvirus]

Hi,

SketchEditor ignore (can't click/touch) when already exists vertex, mostly when 2 vertex are close to each other. 
The white circle for create a new vertex - working great!

I am using:

SketchEditor.StartAsync(SketchCreationMode.Polygon, new SketchEditConfiguration
{
  AllowMove = true,
  AllowVertexEditing = true
});

I tried also to increase the vertex with 

SketchStyle.VertexSymbol

But same behavior.

Any suggestions?

Runtime 100.09

Xamarin.Forms