Apple’s latest update for iOS 14 has fixed a number of bugs, including one affecting some iPhone 12 Mini handsets where the lock-screen display would fail to respond to touch.

Online forums started to fill up with complaints right after the iPhone 12 Mini started landing in customers’ hands following its launch at the end of last week.

Some noted that the issue only occurred when the iPhone 12 Mini had both a case and a screen protector on, though others believed it was the use of a screen protector alone that led to the unusual and frustrating behavior.
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https://www.digitaltrends.com/mobile/iphone-12-mini-lock-screen-bug-squashed-by-new-software-update/