It seems that in the Windows 10 October 2018 Update(1809) problems will not stop appearing. A fresh bug struck the predecessor of 1903, causing PCs to go through a delay when a shutdown occurs.
Luckily, the shutdown delay is not a continuous problem. It appears when plugging into a PC with a USB Type-C controller running October 2018 Update and shutdown without unplugging the controller.
It will take more than 60 seconds to finish the shutdown process, according to the official estimate. Regardless of the device you’re using, the limit is 60 seconds, not less than that, even if you run a high-end PC!
Technically speaking, the fault lies with the USB Type-C Connector System Software Interface (UCSI) because, as with Microsoft, it remains busy with the handling of a USB Type-C device when power down occurs (via Windows Latest).
“A bug in the USB Type-C Connector System Software Interface (UCSI) software application in Windows 10, version 1809 may cause a 60-second delay in the system sleep or shutdown process if power-down occurs while the UCSI software is busy managing a fresh connection or disconnection event on a USB Type-C port,” describes Microsoft.
For the shutdown problem, Microsoft has yet to publish a fix. Just tell your brain to tell you to unplug the Type-C controller before you reach the shutdown button, however, you can prevent it.