This is where the risk assessments haven’t been robust enough. The Covid risk for crew doing IFAM to PVG, HKG, SIN and NRT are minute. That’s a very different risk profile to overnighting at a hotel in London, Paris, Frankfurt or India where theres a good chance one of the crews rooms was cleaned by someone with Covid.
Of course for ignorant bureaucrats there is no nuance to be had, it’s all ‘overseas’ as evidence by the requirement for the crew coming back from Tonga (zero cases) to still isolate.