Story about iOS
TL;DR: each time I "Add to Home Screen" I get a new local storage instance, it seems.
2023.01.16, I add a manifest.json to a simple list app. It is using local storage to save the list client-side. I have previously clicked "Add to Home Screen" on just the web app. Now after adding the manifest.json, I reload the home-screened web app and nothing happens. I decide to, again, click "Add to Home Screen", this time, a new web app appears with the manifest settings applied. But, no shared local storage. I do it again, click "Add to Home Screen", again, new icon, and again, new local storage.