2 3D Touch Unlocking Bug
Apple’s iOS 11.4 release notes don’t mention it, but the software update actually addresses a 3D Touch bug that caused some frustration among users with devices that support that feature. Basically, right after a user unlocked their iPhone, 3D Touch would be rendered unusable for a short period of time.
Because it’s a pretty important and commonly used UI feature, the bug was arguably a bit more annoying than some of the bug patches that made it into the release notes. Despite that, iOS 11.4 addresses the issue, according to a handful of anecdotal user reports.