NestedLiveDataIT flickers on stable-18.8.x: filterListSwitchFromEmptyToValue

What flickers

org.xwiki.livedata.test.ui.AllIT$NestedLiveDataIT#filterListSwitchFromEmptyToValue failed
intermittently on stable-18.8.x: 2 failures in the last 7 Environment Tests builds, 1 of the 4
environments tested (PostgreSQL latest, Tomcat 11-jdk25, S3, Chrome).

Evidence

java.util.concurrent.TimeoutException

Failing build: https://ci.xwiki.org/job/XWiki%20Environment%20Tests/job/xwiki-platform/job/stable-18.8.x/11
(last good build: #8)

Note

This issue was filed automatically by the xwiki-ci-check sweep after the failure repeated across
2 distinct builds on 2 distinct days, which is the evidence bar the sweep requires before filing. It
carries no assignee and no assumption about the cause — if this was mis-filed or is not in fact
flickering, please close it accordingly.