[build][test] ExistenceTests. testNonExistingPackageFragment3 fails with message: pack should not exist

[mpalat]

failure at https://download.eclipse.org/eclipse/downloads/drops4/I20241014-0530/testresults/html/org.eclipse.jdt.core.tests.model_ep434I-unit-win32-java17_win32.win32.x86_64_17.html

org.eclipse.jdt.core.tests.model.ExistenceTests	testNonExistingPackageFragment3	Failure

pack should not exist

junit.framework.AssertionFailedError: pack should not exist
at junit.framework.Assert.fail(Assert.java:57)
at junit.framework.Assert.assertTrue(Assert.java:22)
at junit.framework.Assert.assertFalse(Assert.java:39)
at junit.framework.TestCase.assertFalse(TestCase.java:208)
at org.eclipse.jdt.core.tests.model.ExistenceTests.testNonExistingPackageFragment3(ExistenceTests.java:375)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at junit.framework.TestCase.runTest(TestCase.java:177)
at org.eclipse.jdt.core.tests.junit.extension.TestCase.runTest(TestCase.java:970)
at junit.framework.TestCase.runBare(TestCase.java:142)
at junit.framework.TestResult$1.protect(TestResult.java:122)
at junit.framework.TestResult.runProtected(TestResult.java:142)
at junit.framework.TestResult.run(TestResult.java:125)
at junit.framework.TestCase.run(TestCase.java:130)
at junit.framework.TestSuite.runTest(TestSuite.java:241)
at org.eclipse.jdt.core.tests.model.SuiteOfTestCases$Suite.runTest(SuiteOfTestCases.java:114)
at junit.framework.TestSuite.run(TestSuite.java:236)
at org.eclipse.jdt.core.tests.model.SuiteOfTestCases$Suite.superRun(SuiteOfTestCases.java:97)
at org.eclipse.jdt.core.tests.model.SuiteOfTestCases$Suite$1.protect(SuiteOfTestCases.java:85)
at junit.framework.TestResult.runProtected(TestResult.java:142)
at org.eclipse.jdt.core.tests.model.SuiteOfTestCases$Suite.run(SuiteOfTestCases.java:94)
at junit.framework.TestSuite.runTest(TestSuite.java:241)
at junit.framework.TestSuite.run(TestSuite.java:236)