Last night my Samsung phone updated itself. This morning, each time I opened a PWA, it popped up a warning (“This app is not compatible with this version of Android” and advice to consult the developer.) Clicking “OK” still opens the PWA and it works fine. But each time I opened it, I got the same warning.
Since the PWA itself was working, I tried uninstalling the PWA, going to its web site and reinstalling it. That worked. The warning went away.
I thought it might be useful to others on this site to know what advice to give to users who get the same message.