How to build a polygon on a polynon in a Yandex map?

Question

Yandex maps

Hello, tell me, please, how to build a polygon on a polygon in Yandex maps? For example, there is an editing of an object that already has a polygon drawn on the map, and it is necessary to draw a new one from the top of the old polygon. The situation now is such that when hovering over an old polygon, it is not possible to set the starting point in order to draw a new one. Screenshot example.