Neurons do not reappear after toggling off/on the 3d meshes

Steps:
1) Load a neuronal population with all segments on;
2) toggle off all the segments with the neuronal population on
3) toggle on any segment, the mesh appears but the neurons inside do not
4) if I toggle off all but one segment and load the population, then I add another segment I get the weird behaviour below (one segment with neurons and one without)

I think the expected behavior is that if a population is on, and I toggle on one segment, the neurons inside should appear too.