Random failing TextBlockTest

These two tests failed:
```
org.eclipse.jdt.core.tests.compiler.regression.TextBlockTest.test016b -23
org.eclipse.jdt.core.tests.compiler.regression.TextBlockTest.test023 -23
```
https://github.com/eclipse-jdt/eclipse.jdt.core/pull/3466/checks?check_run_id=34522421368

for example:
```
junit.framework.ComparisonFailure:
Unexpected output running resulting class file for X.java:
--[START]--
---[END]---
.
----------- Expected ------------
\n
\n

Hello, world

\n
\n

------------ but was ------------

---------------------- ----------
expected:<[\n
\n

Hello, world

\n
\n
]> 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.compiler.regression.AbstractRegressionTest.runTest(AbstractRegressionTest.java:3640)
at org.eclipse.jdt.core.tests.compiler.regression.AbstractRegressionTest.runTest(AbstractRegressionTest.java:3290)
at org.eclipse.jdt.core.tests.compiler.regression.AbstractRegressionTest.runConformTest(AbstractRegressionTest.java:2083)
at org.eclipse.jdt.core.tests.compiler.regression.TextBlockTest.runConformTest(TextBlockTest.java:44)
at org.eclipse.jdt.core.tests.compiler.regression.TextBlockTest.test016b(TextBlockTest.java:1635)
```