Flaky ConfigurablePageObject.save() sometimes still on /configSubmit

When using Folder PageObject, I can see sometimes the save() failing, for example by doing:

import org.jenkinsci.test.acceptance.po.Folder;
import org.jenkinsci.test.acceptance.po.Jenkins;
...
Folder folderInController = jenkins.jobs.create(Folder.class, "ControllerFolder");
folderInController.save();

The expect driver url should ends with /job/ControllerFolder/, but is sometimes ending with /job/ControllerFolder/configSubmit and failing.