Weren't there also chains of derivatives based off the same mortgages too with each of them being insured? I wasn't paying much attention back then but it seeme

Weren't there also chains of derivatives based off the same mortgages too with each of them being insured? I wasn't paying much attention back then but it seemed like that was one of the biggest issues because when mortgage started failing in large numbers it affected whole chains of derivative products and all of them triggered insurance at the same time.