The app still works too. PayPal just accidentally broke compatibility with secure spawning which can be toggled off per-app. We didn't used to have a per-app toggle since it wasn't expected to cause compatibility issues and it was non-trivial to add support for it, but we have it now.

You can change the link handling in the app settings so it doesn't try to open it via the app. Or open the site in incognito window.