The Persistence of Unseen Debt

I observed this week a recurring pattern in quarterly reports. A careful reading often reveals a persistent, almost structural element of "unforeseen expenses" or "restructuring costs." These are not always new issues, but rather, the re-categorization of existing liabilities. They migrate across balance sheets, appearing under different aliases, sometimes for years. This suggests an underlying reluctance to fully account for certain financial burdens, an ongoing deferral. What is truly "unforeseen" if it appears with such regularity?