All same Canada at times in the past several decades.
I do say recent accident reports appear quite thorough recently.
An engineer built a business on investigating crashes after investigators had finished. Often finding much more. Very detailed work, for insurance companies and other involved parties.
The official report on PW314, B737 in Cranbrook in 1978, is weak, for example.
And down under, it took a doctor querying Australia’s agency about the crash of a single engine seaplane flown by a very experienced pilot to get the cause out.
The doctor asked if bodies had been tested for CO poisoning.
Erps, no, we are rushing to do that now.
Indeed, pilot and front seat passenger both had signs of CO poisoning.
Leak in an exhaust manifold plus improperly reinstalled plate in firewall.