AsyncStoreFunctionalTest fails intermittently

14:49:46,380 ERROR (testng-AsyncStoreFunctionalTest:) [UnitTestTestNGListener] Test testGetAfterRemove(org.infinispan.loaders.decorators.AsyncStoreFunctionalTest) failed.
java.lang.AssertionError: Keys not empty: [1]
	at org.testng.AssertJUnit.fail(AssertJUnit.java:57)
	at org.testng.AssertJUnit.assertTrue(AssertJUnit.java:22)
	at org.infinispan.loaders.decorators.AsyncStoreFunctionalTest$3.call(AsyncStoreFunctionalTest.java:211)
	at org.infinispan.test.TestingUtil.withCacheManager(TestingUtil.java:1252)
	at org.infinispan.loaders.decorators.AsyncStoreFunctionalTest.testGetAfterRemove(AsyncStoreFunctionalTest.java:165)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:601)
	at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:74)
	at org.testng.internal.Invoker.invokeMethod(Invoker.java:673)
	at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:846)
	at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1170)
	at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125)
	at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:109)
	at org.testng.TestRunner.runWorkers(TestRunner.java:1147)
	at org.testng.TestRunner.privateRun(TestRunner.java:749)
	at org.testng.TestRunner.run(TestRunner.java:600)
	at org.testng.SuiteRunner.runTest(SuiteRunner.java:317)
	at org.testng.SuiteRunner.access$000(SuiteRunner.java:34)
	at org.testng.SuiteRunner$SuiteWorker.run(SuiteRunner.java:351)
	at org.testng.internal.thread.ThreadUtil$CountDownLatchedRunnable.run(ThreadUtil.java:147)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
	at java.lang.Thread.run(Thread.java:722)