reactor.core.Exceptions$BubblingException thrown if exception is thrown in subscribe

[madgnome]

This code should emit a CircuitBreakerOpenException instead we get a reactor.core.Exceptions$BubblingException

    @Test
    public void shouldEmitErrorWithCircuitBreakerOpenException() {
        circuitBreaker.transitionToOpenState();
        StepVerifier.create(
                Mono.error(new IOException("BAM!"))
                        .transform(CircuitBreakerOperator.of(circuitBreaker)))
                .expectError(CircuitBreakerOpenException.class)
                .verify(Duration.ofSeconds(1));

        assertNoRegisteredCall();
    }

( found by https://stackoverflow.com/questions/49276946/resilience4j-how-to-handle-errors-when-using-a-circuit-breaker-in-a-spring-webfl )