Recently, I returned to the game. And I realized that now dump trucks consume sand in autonomous mode.

Has anyone else noticed, or am I doing something wrong?

This symbol I see appear from the beginning of the game but it never affected my playing. The trucks always dumped sand "infinitely".

Now, they just stop halfway, and I have to do everything else manually, because if I put it to do it again, it comes back from the beginning and only dumps the sand always in the same place.

In this print, I am on the first DLC map.

Sorry for the bad English, I used a translator.