Aggregation criteria match mapping fails with `NullPointerException` about spring-data-mongodb HOT 4 CLOSED

@DataMongoTest
@Testcontainers
class TestIdBugRepositoryImplIntTest {


    private static final String ENTITY_ID_1 = "66014bb53e3e9474cc0f39d2";
    private static final String ENTITY_ID_2 = "166014bb53e3e9474cc0f39d2";


    @Autowired
    private MongoTemplate mongoTemplate;

    @Container
    @ServiceConnection
    private static final MongoDBContainer mongoDbContainer = new MongoDBContainer("mongo:6.0");



    @BeforeEach
    void setUp() {

        List<Entity> entities = new ArrayList<>();

        entities.addAll(List.of(
                new Entity(ENTITY_ID_1),
                new Entity(ENTITY_ID_2)

        ));

        mongoTemplate.insertAll(entities);
    }


    // Test if the find method works
    @Test
    void matchById_entity1() {

        final Criteria byEntityId = new Criteria("_id").is(ENTITY_ID_1);
        final MatchOperation matchStage = Aggregation.match(byEntityId);
        Aggregation aggregation = Aggregation.newAggregation(matchStage);

        List<Entity> entities = mongoTemplate.aggregate(aggregation, "testEntity", Entity.class).getMappedResults();

        assertThat(entities, is(notNullValue()));
        assertThat(entities, is(hasSize(1)));
        assertThat(entities.get(0).get_id(), is(ENTITY_ID_1));
    }

    @Test
    void matchById_entity2() {

        final Criteria byEntityId = new Criteria("_id").is(ENTITY_ID_2);
        final MatchOperation matchStage = Aggregation.match(byEntityId);
        Aggregation aggregation = Aggregation.newAggregation(matchStage);

        List<Entity> entities = mongoTemplate.aggregate(aggregation, "testEntity", Entity.class).getMappedResults();

        assertThat(entities, is(notNullValue()));
        assertThat(entities, is(hasSize(1)));
        assertThat(entities.get(0).get_id(), is(ENTITY_ID_2));
    }



    @AfterEach
    void tearDown() {
        mongoTemplate.dropCollection(Entity.class);
    }

    @Document(collection = "testEntity")
    public class Entity {

        @MongoId
        private String _id;

        public Entity(String _id) {
            this._id = _id;
        }

        public String get_id() {
            return _id;
        }
    }
}

Aggregation aggregation = Aggregation.newAggregation(Entity.class, matchStage);