RSSI want to clarify some details: There is no such term as “Vergangenheitsbearbeitung”. The correct terms are:
Vergangenheitsbewältigung,
Aufarbeitung or Geschichtsaufarbeitung.
Vergangenheitsaufarbeitung is possible but it sounds illiterate and mixed-up, something low-educated people would use. I am not sure about the current 2021 year use, though, because of the rapid decline of educational standards and literacy niveau that caused a steep decline in the formal quality of German-language texts in the last decade.
There would be much to say about those strange and unnatural terms Bewältigung and Aufarbeitung anyway. They are borrowed from an un-German and psychologizing vocabulary and are intended to be irritating, nauseating, even as words just as much as they are as concepts.