SectionTest.testSectionEditInWikiEditorWhenSyntax2x (xwiki-enterprise-test-ui) is flaky

expected:<...2
Section3
Content3
[Section4
Content4
Section5
Content5
Section6
Content6]> but was:<...2
Section3
Content3
[Failed to execute the [include] macro. Cause: [You must specify a 'reference' parameter pointing to the entity to include.]. Click on this message for details.]>

org.junit.ComparisonFailure: 
expected:<...2
Section3
Content3
[Section4
Content4
Section5
Content5
Section6
Content6]> but was:<...2
Section3
Content3
[Failed to execute the [include] macro. Cause: [You must specify a 'reference' parameter pointing to the entity to include.]. Click on this message for details.]>
	at org.junit.Assert.assertEquals(Assert.java:115)
	at org.junit.Assert.assertEquals(Assert.java:144)
	at org.xwiki.test.ui.SectionTest.testSectionEditInWikiEditorWhenSyntax2x(SectionTest.java:103)
	at org.xwiki.test.ui.SectionTest.testSectionEditInWikiEditorWhenSyntax2x(SectionTest.java:92)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.xwiki.test.ui.AuthenticationRule$1.evaluate(AuthenticationRule.java:73)
	at org.xwiki.test.ui.browser.BrowserTestRule$1.evaluate(BrowserTestRule.java:104)
	at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55)
	at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55)
	at org.junit.rules.RunRules.evaluate(RunRules.java:20)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at com.google.code.tempusfugit.concurrency.IntermittentTestRunner.runChild(IntermittentTestRunner.java:36)
	at com.google.code.tempusfugit.concurrency.IntermittentTestRunner.runChild(IntermittentTestRunner.java:25)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.junit.runners.Suite.runChild(Suite.java:128)
	at org.junit.runners.Suite.runChild(Suite.java:27)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.junit.extensions.cpsuite.ClasspathSuite.run(ClasspathSuite.java:194)
	at org.xwiki.test.integration.XWikiExecutorSuite.run(XWikiExecutorSuite.java:195)
	at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:367)
	at org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:274)
	at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:238)
	at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:161)
	at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:290)
	at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:242)
	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:121)