The cargo disappears when you change the type of trailer.

[AntonioMart]

The cargo disappears when you change the type of trailer. But even if you load the previous save and select the trailer that is offered by default, the cargo still disappears. This happens at some bases in different cities. Moreover, an inscription appears that your trailer is ready, proceed to the green marker, but it is not on the map and at the base.

game.log.txt