Thank you for your replies!
So I started the whole campaign from the beginning, to play all of it on the latest patch. I deployed soon my light mortars close to the jeep so they can have radio contact with the FO and ordered to fire on the antitank gun position. after 3 turns, when they should have started with the spotting rounds, they lost contact with the FO, both mortars, same moment, so I guess it is not one of those random issues that can happen to simulate real life inconveniences like radio signal lost. I just went through the next 10 turns quickly just to see if they would have been able to get in touch with FO again but no, that didn't happen. I also tried to move them after that and position them in other spots close to the jeeps but it didn't work so, yes please, I'm opening aticket to check the installation.
Yes, at the moment it is included in the module.