I encountered an issue with reassigning a factory.
What happened went something like this:
Reassign factory from car being produced to new car.
Buy a plot of land for a new factory.
After that, it seems like the first factory disappeared, the area where information about the car in production has no text, but could still be highlighted, but not selected.
There was no change after reloading the game and restarting the client.
I will have to recreate this again to have a save to show you, because I may have deleted the save at some point.