Despite this not being our bug, I still feel our failure mode has regressed in the application for no real benefit.
I took steps now to only have fetch interception (where requests goes out via service worker) enabled only on Android which was the reason we built this in the first place.
Over the past 6 months or so this has generated way too much support so feel it is time to kill off the pain.
https://github.com/discourse/discourse/commit/f8305f53c787ad0b6cd865d56a7b8b0f77f9dcc2