iOS 12.0.1 is now available from Apple.
Upon inserting the charger into the device's port while the display is off, users reported that their iPhone would not automatically begin charging. Instead, they'd only do so if the screen was active when the charging was initiated.
According to the change log, iOS 12.0.1 will fix an issue where some iPhone XS do not charge when it's plugged to a lightning cable.
The new software also tackles a WiFi annoyance that some users had been reporting. Since 5 GHz networks offer faster data speeds than 2.4 GHz, that could have a noticeable impact on usability.
It's worth mentioning that if you are already on iOS 12.0, then upgrading to iOS 12.0.1 won't have any detrimental effect on your ability to jailbreak as there is now no official jailbreak solution available for any flavor of iOS 12 - although the community is rumbling with positivity about the future - meaning that upgrading to iOS 12.0.1 from iOS 12.0 in order to take advantage of the new improvements and stability enhancements shouldn't have a negative effect on you at all.
If you're experiencing issues with your iPhone, update to the latest version of iOS right now.
Other fixes address "issues where subtitles may not appear in some video apps", and "where Bluetooth could become unavailable". It's a roughly 157 MB download, so you might want to be on WiFi when you do that.