Just to confirm, which mission are you stuck on? “Wages Of Fear” or “On The Side Of The Road”?
And when you say that the truck is back at the “original starting spot” do you mean the Ringfort (the garage near the underground base) or that the truck is parked on the road outside the Church?
And you are on the “Talk To Calle” objective, correct?
Try looking around the truck, especially at the front of the truck, a few meters away from it, to see if there is an offset “Talk To Calle” interaction prompt that is located somewhat in front of or behind or on the side of the truck instead of on it.
Other things you could try…
- Try fast traveling to a safehouse really far away and then back to where the truck is located
- Does the issue still occur after restarting the session or restarting the game?
Let me know how that goes for you!
Sorry for the inconvenience and thanks for reporting!