Suddenly having to enter passcode when backing up an unlocked iPhone?

I updated and did backups on two iPhones and two iPads to iOS 15.7.1 via USB. I was asked for a passcode on the devices.

I was curious about the passcode issue so today I tried to do a backup on iTunes and was asked for a passcode. I then tried a backup on iMazing – also requested a passcode.

So this is a feature/bug of iOS 15.7.* and not a feature of using iTunes.

iTunes 12.9.5.5
iMazing 2.14.6 (155535)
macOS Mojave 10.14.6/MacPro 5,1

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