As earthly circles of hell go, modern-day Newark is in an altogether different, gentler category from post-WWII Leningrad. Still, in Kantemir Balagov ‘s long-awaited third feature “ Butterfly Jam ,” industrial New Jersey proves as vivid and specific a backdrop for wilting, marginalized lives as the ruined Russian city did in the filmmaker’s 2019 masterpiece “Beanpole.” Though it’s the director’s first American-set work, he’s not as far from home as initially appears to be the case: A finely textured immigrant community study that engages meaningfully with his own Circassian heritage, “Butterfly Jam” is marked by unsentimental kinship with the rowdy, not-quite-settled expat family at its center, even with actors as unexpected as Barry Keoghan , Riley Keough and Harry Melling playing the parts. But if the film knows its characters like the back of its callused hand, the story in which it places them sometimes unfolds with less conviction and credibility.…