Topography subregion is created in other topography even selecting the wanted


I am experiencing so strange Revit behaviour with topography elements. When creating topography subregion sketch, Revit does not ask to select the topography to be subdivided, in my case it choses a topography that is hidden in other design option rather than the Main topography.

trying to resolve that, I run a dynamo script that selects existing subregions and take the sketches and create subregions with it in the selected topography but it does not work.

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