Hibernate doesn't save a list of authorities of a user to table as separate rows. It saves only one.

I need help to save several roles of a user to database. Using Spring Boot JPA. User can have many roles. A role belongs to one user. I tried to create three users - an admin, a user and a manager. Admin has admin role, user has user role. Manager has both - admin and user roles.
I have Authority class that has a role. The problem is that for the manager hibernate creates only last role - USER. And I expected that it will have both roles. In database I see that manager has only 1 row. And it should have 2 rows. What am I doing wrong?
User:

@Entity
@Table(uniqueConstraints= {@UniqueConstraint(columnNames="username")}, name = "Users")
public class User implements UserDetails{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;
    @NonNull
    private String username;
    @NonNull
    private String password;
    @NonNull
    private String email;
    @OneToMany(mappedBy = "user")
    private List<Authority> authorities = new ArrayList<>();
//...

@Entity
@Table(uniqueConstraints= {@UniqueConstraint(columnNames="username")}, name = "Users")
public class User implements UserDetails{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;
    @NonNull
    private String username;
    @NonNull
    private String password;
    @NonNull
    private String email;
    @OneToMany(mappedBy = "user")
    private List<Authority> authorities = new ArrayList<>();
//...

@Entity
@Table(uniqueConstraints= {@UniqueConstraint(columnNames="username")}, name = "Users")
public class User implements UserDetails{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;
    @NonNull
    private String username;
    @NonNull
    private String password;
    @NonNull
    private String email;
    @OneToMany(mappedBy = "user")
    private List<Authority> authorities = new ArrayList<>();
//...

@Entity
@Table(uniqueConstraints= {@UniqueConstraint(columnNames="username")}, name = "Users")
public class User implements UserDetails{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;
    @NonNull
    private String username;
    @NonNull
    private String password;
    @NonNull
    private String email;
    @OneToMany(mappedBy = "user")
    private List<Authority> authorities = new ArrayList<>();
//...

Authority:

@Entity
public class Authority implements GrantedAuthority {
    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;
    @Enumerated(EnumType.STRING)
    private Role authority;
    @JsonIgnore
    @ManyToOne(optional = false)
    private User user;
//...

@Entity
public class Authority implements GrantedAuthority {
    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;
    @Enumerated(EnumType.STRING)
    private Role authority;
    @JsonIgnore
    @ManyToOne(optional = false)
    private User user;
//...

@Entity
public class Authority implements GrantedAuthority {
    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;
    @Enumerated(EnumType.STRING)
    private Role authority;
    @JsonIgnore
    @ManyToOne(optional = false)
    private User user;
//...

@Entity
public class Authority implements GrantedAuthority {
    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;
    @Enumerated(EnumType.STRING)
    private Role authority;
    @JsonIgnore
    @ManyToOne(optional = false)
    private User user;
//...

Hibernate doesn't save a list of authorities of a user to table as separate rows. It saves only one.

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