Topography.Points returns Empty List

Hi,

Attached are a WIP dyn and the test subject.

I have no idea why often, from the last node of group 3 to the first node of group 4, something is lost and the Topography.Points just can’t find the points of the previously selected topo subregion. Can anyone help me?

teste_selecionaPisoAjustaTopografia.dyn (84.0 KB)

rac_basic_sample_project.rvt (2.6 MB)