Thanks for taking the time to respond! I’ve tried refreshing a couple of times and I’m afraid it made no difference. Chrome and Firefox all use the same embedded WebKit, so I’m afraid it still happens on them. I have XCode with an iOS 14 (as well as some similarly-old) Simulators if you’d like me to see if I can isolate and upload that, but according to Apple documentation[0] you should be able to download older simulators from Settings->Components->Add Platforms.
[0]: https://developer.apple.com/documentation/xcode/downloading-...