The iOS 12.1.2 update fixes a number of problems, but users have discovered problems lurking in the final version of the update.

iOS 12.1.2 solves a few iPhone XS, iPhone XS Max and iPhone XR problems, but it looks like the new version of iOS 12 is causing problems for some users. Some of these problems are new, others have carried over from the previous versions of iOS.

The current list of iOS 12.1.2 problems includes weird battery drain, issues with Wi-Fi, Bluetooth problems, issues with Touch ID, sound problems, and more.
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https://www.gottabemobile.com/ios-12-problems-fixes/