If there is a bug, we will fix it. Bugs can be reported at https://bugs.webkit.org. We would never intentionally prevent web technology from working when a site is added to the Home Screen and opened as a web app.
https://bugs.webkit.org/show_bug.cgi?id=254545
https://bugs.webkit.org/show_bug.cgi?id=249645
Thanks!
Also wanted to point out that the user feedback in https://bugs.webkit.org/show_bug.cgi?id=249645 is not the way we should treat browser developers. (Not blaming the parent - I assume this is some other user being..... cranky?)