I have a similar issue with 5.2.2 and it may be related: when loading an enhanced Entity which has a field annotated with @OneToOne(mappedBy = "...", fetch = LAZY) and @LazyToOne(NO_PROXY) using EM.find(Class, key), I get this Exception:

java.lang.ClassCastException: org.hibernate.bytecode.enhance.spi.LazyPropertyInitializer$1 cannot be cast to [Ljava.lang.Object;