31 Random failing JavadocBugsCompletionModelTest, JavadocFieldCompletionModelTest, JavadocMethodCompletionModelTest

https://download.eclipse.org/eclipse/downloads/drops4/I20241118-1800/testresults/html/org.eclipse.jdt.core.tests.model_ep434I-unit-linux-x86_64-java17_linux.gtk.x86_64_17.html
for example:
```
junit.framework.ComparisonFailure: Completion proposals are not correct!.
----------- Expected ------------
Object[JAVADOC_TYPE_REF]{{@link Object}, java.lang, Ljava.lang.Object;, null, null, [46, 49], 85}\n
Object[TYPE_REF]{Object, java.lang, Ljava.lang.Object;, null, null, [46, 49], 54}
------------ but was ------------

---------------------- ----------
expected:<[Object[JAVADOC_TYPE_REF]{{@link Object}, java.lang, Ljava.lang.Object;, null, null, [46, 49], 85}\n
Object[TYPE_REF]{Object, java.lang, Ljava.lang.Object;, null, null, [46, 49], 54}]> but was:<[]>
at org.eclipse.jdt.core.tests.junit.extension.TestCase.assertStringEquals(TestCase.java:265)
at org.eclipse.jdt.core.tests.junit.extension.TestCase.assertEquals(TestCase.java:240)
at org.eclipse.jdt.core.tests.model.AbstractJavadocCompletionModelTest.assertResults(AbstractJavadocCompletionModelTest.java:283)
at org.eclipse.jdt.core.tests.model.AbstractJavadocCompletionModelTest.assertSortedResults(AbstractJavadocCompletionModelTest.java:253)
at org.eclipse.jdt.core.tests.model.JavadocBugsCompletionModelTest.testBug117183c(JavadocBugsCompletionModelTest.java:653)
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)
at junit.framework.TestSuite.runTest(TestSuite.java:2
```

Start with the linked test-results report and reproduce the failures in JavadocBugsCompletionModelTest, JavadocFieldCompletionModelTest, and JavadocMethodCompletionModelTest. Read AbstractJavadocCompletionModelTest.assertResults and assertSortedResults, then investigate why proposals are empty. Done means the affected tests pass reliably without intermittent failures.

Written by the indexing model from the issue text.