In \Drupal\Tests\automatic_updates\Build\CoreUpdateTest::assertUpdateSuccessful we have
// The update form should not have any available updates.
// @todo Figure out why this assertion fails when the batch processor
// redirects directly to the update form, instead of update.status, when
// updating via the UI.
$this->visit('/admin/modules/update');
$this->getMink()->assertSession()->pageTextContains('No update available');
But we don't redirect to the form any more. \Drupal\automatic_updates\BatchProcessor::finishCommit redirects to automatic_updates.finish which is \Drupal\automatic_updates\Controller\UpdateController::onFinish and that redirects to update.status which is the available update reports
fix the assertions
Automatically closed - issue fixed for 2 weeks with no activity.