Fetching Entities described via @EmbeddedId in Spring Batch and with JpaCursorItemReader returns always single value

Bug description
Fetching Entities(UserRole in ManyToOne association) described via jakarta.persistence.EmbeddedId in Spring Batch and with JpaCursorItemReader returns always a single value.

Example: User has two UserRoles with roleId1=1 and roleId2=4. In ItemProcessor I get always either roleId1 or roleI2 but not both.

Environment
Spring boot 3.1.3, Spring Batch 5.0.3, Hibernate-Core 6.2.7

Entities

@Entity
@Table( name = "user"
})
@Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
public class User extends PersonExtendedImpl implements UserDetails, ToDto<UserDTO>, Serializable {

 
    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name = "User_ID")
    private Integer id;
		

    @Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
    @OneToMany(
            mappedBy = "user",
            cascade = CascadeType.ALL,
            orphanRemoval = true)
	private List<UserRole> userRoles = new ArrayList<UserRole>();

        equals, hashcode, getter, setter

@Entity
@Table(name = "user_role",
	   uniqueConstraints={@UniqueConstraint(columnNames = {"User_ID", "Role_ID"})}
)
@Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
public class UserRole implements Serializable {

	@EmbeddedId
        private UserRoleKey id;
	
	@Setter(AccessLevel.NONE)
	@ManyToOne(fetch = FetchType.LAZY)
	@JoinColumn(name = "User_ID", referencedColumnName = "User_ID", insertable=false, updatable=false)
	private User user;
	
	public UserRole(UserRoleKey id) {	
		this.id = id;
	}
        equals, hashcode, getter, setter
}

@Embeddable
public class UserRoleKey implements Serializable {

   @Column(name = "User_ID")
    private Integer userId;

   @Column(name = "Role_ID")
    private Integer roleId;
    
   equals, hashcode, getter, setter
}

Steps to reproduce

	@Bean
	@Scope("prototype")
	Step step( JobRepository jobRepository,
		JpaCursorItemReader<User> userPrivilegeReader,
		CustomerPrivilegeProcessor userPrivilegeProcessor,
		PlatformTransactionManager userTransactionManager) throws Exception {
		
	    return new StepBuilder("customerPrivilegeStep", jobRepository)

		        .<User, User> chunk(10, userTransactionManager)
		        .reader( userPrivilegeReader )
		        .processor( userPrivilegeProcessor )
		        .writer(() -> System.out.println("NOT OKAY  "))
		        .build();
	}

This Step produces correct sql statement but just one UserRole fetched in List of userRoles.

SQL:

			"""
				SELECT u from User u 
				JOIN FETCH u.userRoles ur 
				WHERE u.expiresAt > CURRENT_TIMESTAMP 
				AND u.enabled = true 
				AND u.locked = false """

select u1_0.User_ID,u1_0.Auth_Type,u1_0.Birth_day,u1_0.Country_ID,u1_0.Email,u1_0.Enabled,u1_0.Expires_at,u1_0.First_Name,u1_0.Form_of_Address_ID,u1_0.Last_accessed_at,u1_0.Last_Name,u1_0.Last_updated_at,u1_0.Locked,u1_0.Locked_at,u1_0.Password,u1_0.Phone,u1_0.Registered_at,u1_0.Register_Type,u2_0.User_ID,u2_0.Role_ID,u1_0.Username 
from user u1_0 
join user_role u2_0 on u1_0.User_ID=u2_0.User_ID 
where u1_0.Expires_at>current_timestamp(6) 
and u1_0.Enabled=1 and u1_0.Locked=0

Important!
I could not reproduce the same issue in Spring Boot 3.1.3 and Spring MVC application environment!!!

Expected behavior
JpaItemReaders should fetch all associated Entities(UserRole's) into Collection of parent Entity(User).

The reproduction is centered on JpaCursorItemReader, the User/UserRole entities, and the JOIN FETCH query shown in the issue. Start by running the provided batch step and comparing its processor input with the SQL result, then trace reader and persistence behavior for the @EmbeddedId collection. Done means the reader supplies every associated UserRole for each User, matching the expected behavior.