Default values for some course format options do not apply

Visit 'Site administration' > 'Courses' > 'Courses default settings'. Set the default format to 'Weekly format'. Visit the form to create a new course. Confirm 'Calculate the end date from the number of sections' is checked. Switch to the 'Topics' format. Switch back to 'Weeks' format. Confirm 'Calculate the end date from the number of sections' is checked. Uncheck it. Create the course. Re-edit the course. Confirm the checkbox remains unchecked. Edit the file course/format/weeks/lib.php and search for 'automaticenddate' until you find it's default value and change it to 0. Visit the form to create a new course. Confirm the checkbox is unchecked. NEW: Revert the code changed performed above. Create a course in topics format Edit it and change format to weeks Make sure the 'automaticenddate' is checked