A glitch caused our community's sidebar and widgets to disappear. These can no longer be accessed or edited and happened while making changes

Per title, the sidebar is completely gone and other users see the same issue too (or don't see it basically).

While making updates it suddenly just disappeared and there's no other way to access this other than the little edit icons when viewing the sidebars and widgets on the front end. I've tried in old. and new and any other possible way to rectify it.

How can this be fixed?