I did some digging on the internet to see if I could retrieve some answers. It turns out that males Jasper (P.t. hybrid) and Nickel (Pan troglodytes Verus) were sent on breeding loan to Safari Ravenna.
In a feature on World Chimpanzee Day 2019 an Italian television station made mention of conservation activities at Safari Ravenna for World Chimpanzee Day in 2019. It turns out their group of chimpanzee had been determined to be a new genetic line for the West African verus subspecies. They sent a male from their family group to Ostrava Zoo on breeding loan. They also received 2 new male chimpanzee from the Welsh Mountain Zoo (Jasper and Nickel). The hope is that the newly formed breeding group will start reproducing in due course.
Source:
World Chimpanzee Day: Al Safari Ravenna si festeggia con il successo di un progetto di conservazione europeo - Ravenna Web Tv
BTW: F Menolly (b. December 1984) was previously a female kept at Krefeld Zoo.
In the 2014 studbook the sire for F Jessie remains undetermined (multiple males).