From MacRumors again:

Apple in iOS 12.4 mistakenly unpatched a vulnerability that was fixed in the iOS 12.3 update, leading to a new jailbreak available for iOS 12.4 devices, reports Motherboard. 

I'd love to hear how a regression made it through. And they actually care about jailbreaking. 

Once you discover a bug, you write a test. As long as you're running the test, it doesn't sneak back in. That's why you have the test in the first place.

Wasn't there some comedian that had a bit on auto reservations that sounded like this? Argh. 

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