"BeforeUpdate" hook not working for individual column updates

[Omkarz7]

type User struct {
	ID        int64
	CreatedAt time.Time `sql:"default:now()"`
	UpdatedAt time.Time `sql:"default:now()"`
	Name      string
	Email    string
}

func (m *User) BeforeUpdate(ctx context.Context) (context.Context, error) {
	m.UpdatedAt = timeNow().Round(time.Microsecond)
	return ctx, nil
}

The following two queries don't update the updated_at column

user := &User{ID:1, Email:"some@email.com"} 
_, err := db.ModelContext(ctx, user).Column("email").Where("id = ?", user.ID).Update()
_, err := db.ModelContext(ctx, user).Set("email = ?",users.Email ).Where("id = ?", user.ID).Update()

The below queries work fine and update the updated_at column

user := &User{ID:1, Email:"some@email.com"} 
_, err := db.ModelContext(ctx, user)..WherePK().UpdateNotZero()
_, err := db.ModelContext(ctx, user).Where("id = ?", id).Update()

Is this intended behavior where BeforeUpdate hook is only triggered and used when the values are updated using struct?
Is it possible to have a update tag which updates the updated_at column if it exists. Similar to how soft delete works, where we update deleted_at is set to current time if the column exists and we mention the tag in struct.