Compatibility mode not working with server tasks using Java Streams

<distributed-cache name="analytics">
   <compatibility enabled="true" marshaller="org.infinispan.query.remote.CompatibilityProtoStreamMarshaller"/>
</distributed-cache>

package delays.java.stream.task;

import java.util.Arrays;
import java.util.Calendar;
import java.util.Collections;
import java.util.Date;
import java.util.Locale;
import java.util.Map;
import java.util.TimeZone;
import java.util.TreeMap;
import java.util.stream.Collector;
import java.util.stream.Collectors;

import org.infinispan.Cache;
import org.infinispan.stream.CacheCollectors;
import org.infinispan.tasks.ServerTask;
import org.infinispan.tasks.TaskContext;
import org.infinispan.tasks.TaskExecutionMode;
import org.infinispan.util.function.SerializableSupplier;

import delays.java.stream.pojos.Stop;

public class DelayRatioTask implements ServerTask {

   private TaskContext ctx;

   @Override
   public void setTaskContext(TaskContext ctx) {
      this.ctx = ctx;
   }

   @Override
   public String getName() {
      return "delay-ratio";
   }

   @Override
   public Object call() throws Exception {
      System.out.println("Execute delay-ratio task");

      Cache<String, Stop> cache = getCache();

      Map<Integer, Long> totalPerHour = cache.values().stream()
            .collect(
                  serialize(() -> Collectors.groupingBy(
                        e -> getHourOfDay(e.departureTs),
                        Collectors.counting()
                  )));

      Map<Integer, Long> delayedPerHour = cache.values().stream()
            .filter(e -> e.delayMin > 0)
            .collect(
                  serialize(() -> Collectors.groupingBy(
                        e -> getHourOfDay(e.departureTs),
                        Collectors.counting()
                  )));

      return Arrays.asList(delayedPerHour, totalPerHour);

//      return Arrays.asList(Collections.emptyMap(), Collections.emptyMap());
   }

   @Override
   public TaskExecutionMode getExecutionMode() {
      return TaskExecutionMode.ONE_NODE;
   }

   @SuppressWarnings("unchecked")
   private <K, V> Cache<K, V> getCache() {
      return (Cache<K, V>) ctx.getCache().get();
   }

   private static <T, R> Collector<T, ?, R> serialize(SerializableSupplier<Collector<T, ?, R>> s) {
      return CacheCollectors.serializableCollector(s);
   }

   private static int getHourOfDay(Date date) {
      Calendar c = Calendar.getInstance(TimeZone.getTimeZone("GMT+1"), Locale.ENGLISH);
      c.setTime(date);
      return c.get(Calendar.HOUR_OF_DAY);
   }

}

java.lang.AssertionError: org.infinispan.client.hotrod.exceptions.HotRodClientException:Request for messageId=333 returned server error (status=0x85): java.util.concurrent.ExecutionException: java.lang.ClassCastException: [B cannot be cast to delays.java.stream.pojos.Stop
java.lang.ClassCastException: [B cannot be cast to delays.java.stream.pojos.Stop
	at delays.java.stream.AnalyticsUtil.timed(AnalyticsUtil.java:16)
	at delays.java.stream.AnalyticsVerticle.getDelaysRatio(AnalyticsVerticle.java:72)
	at io.vertx.ext.web.impl.BlockingHandlerDecorator.lambda$handle$0(BlockingHandlerDecorator.java:48)
	at io.vertx.core.impl.ContextImpl.lambda$executeBlocking$1(ContextImpl.java:271)
	at io.vertx.core.impl.TaskQueue.lambda$new$0(TaskQueue.java:60)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
Caused by: org.infinispan.client.hotrod.exceptions.HotRodClientException:Request for messageId=333 returned server error (status=0x85): java.util.concurrent.ExecutionException: java.lang.ClassCastException: [B cannot be cast to delays.java.stream.pojos.Stop
java.lang.ClassCastException: [B cannot be cast to delays.java.stream.pojos.Stop
	at org.infinispan.client.hotrod.impl.protocol.Codec20.checkForErrorsInResponseStatus(Codec20.java:363)
	at org.infinispan.client.hotrod.impl.protocol.Codec20.readPartialHeader(Codec20.java:152)
	at org.infinispan.client.hotrod.impl.protocol.Codec20.readHeader(Codec20.java:138)
	at org.infinispan.client.hotrod.impl.operations.HotRodOperation.readHeaderAndValidate(HotRodOperation.java:60)
	at org.infinispan.client.hotrod.impl.operations.ExecuteOperation.executeOperation(ExecuteOperation.java:50)
	at org.infinispan.client.hotrod.impl.operations.RetryOnFailureOperation.execute(RetryOnFailureOperation.java:56)
	at org.infinispan.client.hotrod.impl.RemoteCacheImpl.execute(RemoteCacheImpl.java:542)
	at delays.java.stream.AnalyticsVerticle.lambda$getDelaysRatio$1(AnalyticsVerticle.java:73)
	at delays.java.stream.AnalyticsUtil.timed(AnalyticsUtil.java:14)
	... 7 more

10:36:18,765 WARN  [org.infinispan.remoting.inboundhandler.NonTotalOrderPerCacheInboundInvocationHandler] (remote-thread--p2-t22) ISPN000071: Caught exception when handling command StreamRequestCommand{type=TERMINAL_REHASH, includeLoader=true, terminalOperation=org.infinispan.stream.impl.termop.SegmentRetryingOperation@1b024f9, topologyId=9, id=datagrid-1-bmspw0, segments=[128, 130, 6, 135, 137, 138, 11, 12, 140, 13, 143, 16, 144, 17, 146, 22, 152, 155, 28, 29, 31, 36, 37, 41, 42, 44, 172, 173, 177, 178, 179, 181, 183, 57, 185, 60, 61, 189, 64, 192, 65, 193, 66, 197, 201, 75, 204, 207, 80, 208, 82, 83, 84, 212, 85, 86, 89, 92, 96, 225, 98, 226, 99, 100, 101, 102, 231, 105, 233, 234, 107, 108, 237, 112, 242, 115, 246, 247, 120, 251, 124, 125, 253, 255], keys=[], excludedKeys=[]}: java.lang.ClassCastException: [B cannot be cast to delays.java.stream.pojos.Stop
	at java.util.stream.Collectors.lambda$groupingBy$45(Collectors.java:907)
	at java.util.stream.ReduceOps$3ReducingSink.accept(ReduceOps.java:169)
	at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
	at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
	at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
	at java.util.Spliterators$IteratorSpliterator.tryAdvance(Spliterators.java:1812)
	at org.infinispan.commons.util.Closeables$SpliteratorAsCloseableSpliterator.tryAdvance(Closeables.java:144)
	at java.util.Spliterator.forEachRemaining(Spliterator.java:326)
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
	at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
	at org.infinispan.stream.impl.local.LocalCacheStream.collect(LocalCacheStream.java:259)
	at org.infinispan.stream.impl.TerminalFunctions$CollectorFunction.apply(TerminalFunctions.java:1093)
	at org.infinispan.stream.impl.TerminalFunctions$CollectorFunction.apply(TerminalFunctions.java:1083)
	at org.infinispan.stream.impl.termop.SegmentRetryingOperation.innerPerformOperation(SegmentRetryingOperation.java:68)
	at org.infinispan.stream.impl.termop.SegmentRetryingOperation.performOperation(SegmentRetryingOperation.java:79)
	at org.infinispan.stream.impl.LocalStreamManagerImpl.streamOperationRehashAware(LocalStreamManagerImpl.java:302)
	at org.infinispan.stream.impl.StreamRequestCommand.invokeAsync(StreamRequestCommand.java:96)
	at org.infinispan.remoting.inboundhandler.BasePerCacheInboundInvocationHandler.invokeCommand(BasePerCacheInboundInvocationHandler.java:102)
	at org.infinispan.remoting.inboundhandler.BaseBlockingRunnable.invoke(BaseBlockingRunnable.java:99)
	at org.infinispan.remoting.inboundhandler.BaseBlockingRunnable.runAsync(BaseBlockingRunnable.java:71)
	at org.infinispan.remoting.inboundhandler.BaseBlockingRunnable.run(BaseBlockingRunnable.java:40)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)