This is from Wiki, so yes, grain of salt. However, a quick Google of other sites also speak of east forn operations by KG77.
Only I and III./KG 77 were the only units that were committed to Operation Barbarossa, with a total of 59 Ju 88s.[5] The Geschwader supported Army Group Norths drive into the Baltic states and took part in the Siege of Leningrad. During this period I./KG 77 helped defeat a strong Soviet counter-attack by the 11th Army and 34th Army. KG 77 also supported Operation Beowulf, the invasion of the Baltic islands of Osel, Moon and Dago. during the battle for Estonia inflicted severe losses on Soviet shipping, with the same dive-bombing tactics used over Norway, France and Britain. KGr 806 sank the Soviet destroyer Karl Marx on 8 August 1941 in Loksa Bay, Tallinn.[6] On 28 August the Ju 88s had more success when KG 77 and KGr 806 sank the 2,026 grt steamer Vironia, the 2,317 grt Lucerne, the 1,423 Artis Kronvalds and the ice breaker Krisjanis Valdemars (2,250 grt). The rest of the Soviet "fleet", were forced to change course. This took them through a heavily mined area. As a result, 21 Soviet warships, including five destroyers, struck mines and sank. On 29 August, the Ju 88s accounted for the transport ships Vtoraya Pyatiletka (3,974 grt), Kalpaks (2,190 grt) and Leningradsovet (1,270 grt) sunk. Furthermore, the ships Ivan Papanin, Saule, Kazakhstan and the Serp i Molot were damaged. Some 5,000 Soviet soldiers were lost.[7] KG 77 was largely withdrawn from Russia, although I./KG 77 continued to operate on the Eastern Front until July 1942, supporting German forces at the Operation Seydlitz and the Second Battle of Kharkov.
So it's possible this plane from 2/KG77 stayed east until July 1942 and then moved to Sicily.