SectionEditIT#testSectionSaveDoesNotOverwriteTheTitle is flickering

The functional test org.xwiki.flamingo.test.docker.AllIT$NestedSectionEditIT#testSectionSaveDoesNotOverwriteTheTitle fails intermittently on the CI, on stable-18.8.x.

The failure happens in the test's setup, while it saves the language settings in XWiki.XWikiPreferences:

org.opentest4j.AssertionFailedError: Unexpected internal server error with message [com.xpn.xwiki.XWikiException: Error number 3201 in 3: Exception while saving document xwiki:XWiki.XWikiPreferences]
        at org.xwiki.test.ui.TestUtils.assertStatusCodes(TestUtils.java:2543)
        at org.xwiki.flamingo.test.docker.SectionEditIT.setLanguageSettings(SectionEditIT.java:146)
        at org.xwiki.flamingo.test.docker.SectionEditIT.testSectionSaveDoesNotOverwriteTheTitle(SectionEditIT.java:221)

Where it happens

Over the last 28 days, Develocity records 3 failures in 583 executions (0.5%). The failure above accounts for 2 of them, both in one configuration:

• stable-18.8.x / chrome / postgresql latest / tomcat 11-jdk25: 2/15 (13.3%), first 2026-09-24, last 2026-09-30

The third failure (2026-09-18, stable-18.4.x) was a browser that could not be reached during environment setup, which is unrelated. This test has not failed in the other 28 configurations it runs in.

Evidence

• Build scans: https://community.develocity.cloud/s/tgjwtlr6zquiq , https://community.develocity.cloud/s/mie6qutgkh4ds

Affected tests

• org.xwiki.flamingo.test.docker.AllIT$NestedSectionEditIT#testSectionSaveDoesNotOverwriteTheTitle

Affected branches: stable-18.8.x.

Verifying a fix

At the 5.3% failure rate seen in the affected configurations, about 56 consecutive clean runs there are needed to conclude the failure stopped. They must be on chrome / postgresql latest / tomcat 11-jdk25.

Filed automatically by the daily CI check. If this is wrong or already covered by another issue, just close it.