Comment by ben_w

They must have had monitoring in order to be able to detect this retrospectively.

Any automated alarms for detecting things in real-time were not sufficient.

Given a previous generation of agents discovered a zero-day and used it to get around attempts to sandbox them into one specific test, this is not hugely surprising, but it is a reason to force them (and everyone else) to stop until security catches up with capabilities.

I'm thinking of the Jurassic Park novel: they had sensors to count the dinosaurs, but the test was made under the assumption escapes were possible and breeding was not, i.e. something like "if (dinosaurs_found < n) then escape_alert();". They didn't know dinosaurs_found >> n until everything was already going wrong.