I changed a managed navigation term set and added it to a site in a way that broke the attachment of the term set to the other sites that were using it. All users were seeing an error message of: "Error loading navigation: The Managed
Navigation term set is improperly attached to the site." After several (lots) of page refreshes, the navigation links would appear, but once we refreshed the page again, the links would be replaced by the error message.
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