Prometheus ClassCastException while scraping about spring-boot HOT 3 CLOSED

@Service
public class TimedAnnotationService {

  private final AtomicInteger atomicInteger = new AtomicInteger();

  @Timed(value = "timed.increase")
  public int timedIncrease() {
    return atomicInteger.incrementAndGet();
  }

  @Timed(value = "timed.increase", histogram = true)
  public int timedHistogramIncrease() {
    return atomicInteger.incrementAndGet();
  }
}

@ExtendWith(SpringExtension.class) 
@SpringBootTest
@AutoConfigureObservability
class MicrometerTest {

  @Autowired
  private MeterRegistry meterRegistry;

  @Autowired
  private TimedAnnotationService timedService;
  
  @Test
  void testMicrometerTimedHistogramAnnotation() throws Exception {
    assertThat(timedService.timedIncrease()).isEqualTo(1);
    assertThat(timedService.timedHistogramIncrease()).isEqualTo(2);

    ((PrometheusMeterRegistry) meterRegistry).scrape("application/openmetrics-text; version=1.0.0; charset=utf-8");
  }
}

package com.example;

import io.micrometer.core.instrument.Timer;
import io.micrometer.core.instrument.Timer.Sample;
import io.micrometer.prometheusmetrics.PrometheusConfig;
import io.micrometer.prometheusmetrics.PrometheusMeterRegistry;

public class Reproducer {

	public static void main(String[] args) throws InterruptedException {
		PrometheusMeterRegistry registry = new PrometheusMeterRegistry(new PrometheusConfig() {
			
			@Override
			public String get(String key) {
				return null;
			}
			
		});
		
		timed(registry, false, "one");
		timed(registry, true, "two");
		
		System.out.println(registry.scrape("application/openmetrics-text; version=1.0.0; charset=utf-8"));
	}
	
	static void timed(PrometheusMeterRegistry registry, boolean histogram, String methodName) throws InterruptedException {
		Sample sample = Timer.start(registry);
		Thread.sleep(500);
		sample.stop(Timer.builder("example").publishPercentileHistogram(histogram).tag("method-name",  methodName).register(registry));
	}

}