[random test failure] MenuUiTest::testMenuAdministration can generate "escaped locator"

https://www.drupal.org/pift-ci-job/2643018 →

This random failure popped up once in https://www.drupal.org/pift-ci-job/2643038 →

This seems to be due to random machine names and could be related to 📌 randomMachineName() should conform to processMachineName() pattern Fixed which mentions this test specifically.