No code completion in Stream#map() function's lambda expression body unless there is a return statement already

import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

public class Test {

    static class Student {

        private Integer id;
        private Integer age;
        private String gender;
        private String firstName;
        private String lastName;

        public Integer getId() {
            return id;
        }

        public void setId(Integer id) {
            this.id = id;
        }

        public Integer getAge() {
            return age;
        }

        public void setAge(Integer age) {
            this.age = age;
        }

        public String getGender() {
            return gender;
        }

        public void setGender(String gender) {
            this.gender = gender;
        }

        public String getFirstName() {
            return firstName;
        }

        public void setFirstName(String firstName) {
            this.firstName = firstName;
        }

        public String getLastName() {
            return lastName;
        }

        public void setLastName(String lastName) {
            this.lastName = lastName;
        }

        public Student(Integer id, Integer age, String gender, String firstName, String lastName) {
            this.id = id;
            this.age = age;
            this.gender = gender;
            this.firstName = firstName;
            this.lastName = lastName;
        }

    }

    public static void main(String[] args) {
        Student e1 = new Student(1, 23, "M", "Rick", "Beethoven");
        Student e2 = new Student(2, 13, "F", "Martina", "Hengis");
        Student e3 = new Student(3, 43, "M", "Ricky", "Martin");
        Student e4 = new Student(4, 26, "M", "Jon", "Lowman");
        Student e5 = new Student(5, 19, "F", "Cristine", "Maria");

        List<Student> students = Arrays.asList(e1, e2, e3, e4, e5);
        students.stream()
                .map(s -> {
                    s.setAge(s.getAge() + 1);
                    return s;                                                             
                })
                .collect(Collectors.toList());
    }
}

students.stream()
	.map(s -> {
	    s.setAge(s.getAge() + 1); // no code completion for getter and setter here
	    // return s;                                                             
	})
	.collect(Collectors.toList()); // no code completion here