The Prema driver ran into the back of Trident rival Bortoleto after he had passed him for ninth at Turn 1 on lap nine.
Bortoleto slowed before coming to a stop on track after Radillon having suffered damage to the rear of his car, prompting another safety car in a much-interrupted race.
The penalty drops Beganovic from ninth in the classification to 23rd. He also received two penalty points for the incident.
Speaking after the collision, Bortoleto said: “We were in T1, I think conditions were very tricky in this moment.
“I think for him it’s just the braking point, he braked a little bit too late and at the end he hit me and hit my diffuser.
“Then after we don’t know what happened exactly, we don’t know if this is the reason we stop two corners later or not, but we had a problem on the car.
“Things that can happen in the race, especially in these conditions when it’s wet and drying up and slick tyres are very tricky.
“So I don’t blame him, it’s racing and let’s go for it tomorrow.”
He added: “It wasn’t a puncture, it was probably something on the back of my car when I got hit but we are not sure.”
The FIA stewards said: “On the approach to Turn 1, Car 2 was behind Car 5. At the breaking point, Car 2 misjudged his speed and position behind Car 5 and subsequently collided into Car 5.
“The driver of Car 2 explained that any other evasive action by him may have resulted in a more serious collision.
“The Stewards appreciated the driver's candid feedback and for taking responsibility for the incident.”
Campos Racing title rival Pepe Marti escaped any further action after he crashed into Rodin Carlin driver Ido Cohen when rejoining the track.
Source: Autosport