Scenario Drag Line Class 66

hi guys,

i try to finish the Scenario 7 with class 66 (drag line) but I have a red light and i cannot go forward.

I reload a save after an electrical problem (irl) but i dont know where the problem come from - game or save).
I had the same problem with a scenario in US after a save loading and had to launch the scenario again.

Please could you help ?
thanks !

 

Edit : has worked after done the scenario a second time...

 

yes, it's a bug. If you save it will not complete.