Examples of Tibetans don't fit here. Generally, Nepalese don't have any ill feelings towards Tibetans. Government of Nepal deports them on the pressure of chinese government and give the refugee status to them on the pressure from indian and US governments or UN. So Nepalese government does what other governments tell them to do. I think, by default Nepalese government turns blind eye to tibetans crossing the border; but returns them when chinese pressure them.