I had 2 dupes on distand planetoid and suddenly I have noticed that they are not there anymore. I thought they died, but then I found them in a starting planetoid. Then I brought 1 of them back with a rocket and planetoid lander, but soon enough he teleported back to homeland again. Very frustrating, not tried to bring them back again yet
Not exactly sure how it happened, but I think it is related to turning on Alert priority and dupes don't have the skill to do that task. However, it only happened in one specific planetoid and only recently (2 times already), this has not happened before in 1800 cycles.