We're upgrading one of our custom plugins to 4.5 and noticed that sectionRefreshed custom JS event (core_course:sectionRefreshed) is not triggered anymore when the section visibility is changed on the course page. 
 
Looks like dispatching sectionRefreshed event is missing in _reloadSection
 https://github.com/moodle/moodle/blob/main/course/format/amd/src/local/content.js#L662
 
In our case our custom plugin adds extra HTML bits to the section. JS code looks like following
 

document.querySelector(SELECTORS.PAGE).addEventListener(CourseEvents.sectionRefreshed, (event) => {

    if (event.detail.newSectionElement !== undefined) {

        event.detail.newSectionElement.querySelectorAll(SELECTORS.ACTIVITY_CHOOSER).forEach(element => {

            initAddBentoBoxLink(element);

        });

    }

}); 

This works ok in Moodle 4.1