We was travelling to Reeding in a car and stop to put a tent. There was desert location with cave entrance.
My companions went to cave and i manage to put a tent. I upgraded camp fire took map and left. I met my companions in Reeding and wanted to go back to tent location but there was no tent, even a car anymore.
On world map ther was only Cavern2 location. I contacted with admin (+requesthelp) and he helped us.
There is probably bug - in 2 stages encounter location ( eg desert with cave entrance) game shouldnt let to put a tent (when companions are on second location). So dont try to put a tent i such situations.