Issue with reactor. like a snake biting its own tail.

SnakeTail.java

import org.junit.jupiter.api.Test;
import reactor.core.publisher.Mono;

import java.time.Duration;

/**
 *
 */
public class TestBidon {

    private static <T> Mono<T> peekPrint(T value) {
        System.out.print("Hey la: ");
        System.out.println(value);
        return Mono.just(value).doOnSubscribe(s -> System.out.println("My"));
    }

    @Test
    public void testbidon1() {
        Mono.just("OK")
            .doOnSubscribe(s -> System.out.println("18"))
            .flatMap(TestBidon::peekPrint)
            .doOnSubscribe(s -> System.out.println("17"))
            .flatMap(
                    o -> Mono.just(1)
                             .doOnSubscribe(s -> System.out.println("16"))
            )
            .doOnSubscribe(s -> System.out.println("15"))
            .transform(
                    f -> f
                            .doOnSubscribe(s -> System.out.println("14"))
                            .flatMap(TestBidon::peekPrint)
                            .doOnSubscribe(s -> System.out.println("13"))
                            .flatMapMany(
                                    l -> f
                                            .doOnSubscribe(s -> System.out.println("12"))
                            )
            )
            .doOnSubscribe(s -> System.out.println("11"))
            .subscribe(s -> System.out.println("end1"));
    }

    @Test
    public void testbidon2() {
        Mono.just("OK")
            .doOnSubscribe(s -> System.out.println("28"))
            .flatMap(TestBidon::peekPrint)
            .doOnSubscribe(s -> System.out.println("27"))
            .flatMap(
                    o -> Mono.just(1)
                             .doOnSubscribe(s -> System.out.println("26"))
            )
            .doOnSubscribe(s -> System.out.println("25"))
            .transform(
                    f -> f
                            .doOnSubscribe(s -> System.out.println("24"))
                            .flatMap(TestBidon::peekPrint)
                            .doOnSubscribe(s -> System.out.println("23"))
                            .map(l -> l)
                            .doOnSubscribe(s -> System.out.println("22"))
            )
            .doOnSubscribe(s -> System.out.println("21"))
            .subscribe(s -> System.out.println("end2"));
    }

    @Test
    public void testbidon3() {
        Mono.just("OK")
            .doOnSubscribe(s -> System.out.println("35"))
            .flatMap(TestBidon::peekPrint)
            .doOnSubscribe(s -> System.out.println("34"))
            .flatMap(
                    o -> Mono.just(1)
                             .doOnSubscribe(s -> System.out.println("33"))
            )
            .doOnSubscribe(s -> System.out.println("32"))
            .flatMap(TestBidon::peekPrint)
            .doOnSubscribe(s -> System.out.println("31"))
            .subscribe(s -> System.out.println("end3"));
    }

}