Directed by Marc Forster (“Finding Neverland”), the movie is also also a sequel of sorts—perhaps it’s more accurate to call it a “universe expander”—to 2017 “Wonder,” Stephan Chbosky’s film of a Palacio novel about a smart, kindhearted, wise boy named August “Auggie” Pullman who was born with a facial deformity, mandibulofacial dysostosis, and struggled to be accepted by classmates. “White Bird” stands alone as a movie but does have a connection to “Wonder”: the object of the lesson is Julian Albans (Bryce Gheisar, the only returning cast member fro the earlier film), one of the boys who used to bully Auggie, and ultimately apologized to him, but only after being expelled.