An early iOS 14 flaw has re-emerged in a slightly different way, once again undermining the ability to set default apps for email and web browsing.

According to some iOS 14 users, default choices reset to Apple’s Safari and Mail apps whenever the third-party apps are updated from the App Store.
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https://www.trustedreviews.com/news/apple-is-struggling-to-perfect-one-a-signature-ios-14-feature-4105155