Automated tests are failing on 8.x-3.x

Fixed the inner working of \Drupal\Tests\field_group\FunctionalJavascript\FieldGroupUiTest::testCreateAndEdit(), but it seems the last test failure is legit.

The label element is being unset from format_settings since #2824350: missing UI for description text for field groups, so I removed these assertions from the test.

Let's go with the smallest possible change and leave the duplicate label schema for a follow-up.

+++ b/tests/src/FunctionalJavascript/FieldGroupUiTest.php
@@ -100,10 +104,7 @@ class FieldGroupUiTest extends WebDriverTestBase {
-    $this->assertSame('Test 1 - Update', $display->getThirdPartySetting('field_group', 'group_test_1')['format_settings']['label']);
...
-    $this->assertSame('Test 2 - Update', $display->getThirdPartySetting('field_group', 'group_test_2')['format_settings']['label']);

#7 Are you referring to these lines? The label property was removed in #2824350: missing UI for description text for field groups since its data was added twice in the configuration. This is what I referred to in #4:

field_group_group_save()

if (isset($display)) {
    // Remove label from the format_settings.
    unset($group->format_settings['label']);

    $data = (array) $group;
    unset($data['group_name'], $data['entity_type'], $data['bundle'], $data['mode'], $data['form'], $data['context']);
    $display->setThirdPartySetting('field_group', $group->group_name, $data);
    $display->save();
  }

Cheers! I filed a followup to enable strict config schema checking at #3085225: Enable strict config schema checking in \Drupal\Tests\field_group\Functional\ManageDisplayTest