The nested enum java.time.temporal.JulianFields.Field declare a serialVersionUID field. Per the serialization spec, a serialVersionUID field in an enum is ignored.

"The process by which enum constants are serialized cannot be customized: any class-specific writeObject, readObject, readObjectNoData, writeReplace, and readResolve methods defined by enum types are ignored during serialization and deserialization. Similarly, any serialPersistentFields or serialVersionUID field declarations are also ignored--all enum types have a fixed serialVersionUID of 0L. Documenting serializable fields and data for enum types is unnecessary, since there is no variation in the type of data sent."
https://docs.oracle.com/javase/10/docs/specs/serialization/serial-arch.html#serialization-of-enum-constants

Therefore, this misleading field should be deleted.