Tabset for manage contribution pages or manage events requires Classname to equal path
If you add a tab to a tabset for Configure Event, it will work fine with the last word of the class name different from the last word of the path, except for trying to save, which will save, but redirect to Manage Events instead of staying on the same tab. This is because code here expects lastWord from CRM_myExtension_Form_lastWord to be the same as the path, i.e. /civicrm/event/manage/lastword. Everything else works as expected if these are different, except Save.
Looks like this same issue exists for Contribution Pages and probably elsewhere.
For now, I've added a warning to the docs for the tabset hook. It would be good to fix this so the code linked above uses the path for the url instead of the class, at some point.