Island detection

[GrishaPortnikov]

Hi,

I use Router.TryCheckConnectivity method to detect points on islands (if points are forward and backward disconnected).

As far as I understood the island detection logic determines potential points on islands because it uses a radius.
That's why I've decided to build routes with potential points on islands and some known point to be sure they are really on islands.
But, in all my tests, I didn't get any successful route with points on islands.

Is my assumption about potential points on islands correct or I misunderstood something?

Thank you in advance