Can anyone from the Apple team respond to this thread? I've been waiting on any reaction for literal months now and have to communicate to my client soon whether his clients will have to use the app in Safari or whether an update is scheduled that fixes these issues so that they can use the installed PWA.

Since yesterday it seems to be working again on my iPhone X and iPad Air running iOS 15.6. Can anybody confirm that it has been patched or something? My client is organizing a trading floor event in October and there will be a lot of people that are using a standalone PWA to trade. The only stable workaround so far was to use Safari instead of the installed PWA, but it is definitely not great having to communicate this to everybody.

It seems to be fixed since today. Edit: It seems to still be broken, but it works if I open an installed PWA, then open Safari and then go back to the installed PWA. If I close Safari and restart the PWA, it will be broken again.

Still an issue for my PWAs. I hope this gets fixed soon.