Answer was found, it has to do with Windows 10 and "Fast Startup" being enabled. So perhaps it changed, or it was disabled before hand and the update enabled it.
If anyone has this issue, which according to the Microsoft forums some do.
Thread:
https://answers.microsoft.com/en-us/windows/forum/windows_10-power/windows-10-not-shutting-down-afte...Excerpt: Dear Guys,
It seems very simple to resolve the aforesaid problem (We cannot shutdown certain PC's after updating
into Windows 10 Creators update), by doing below said steps in our PC.
1. Go to windows icon (extreme left and bottom of your PC), and use normal mouse button ( left mouse button) and select "settings" > (find "Power & sleep" in the left side menus displayed in the opened box) click on it
> Go to "Related settings" and go to next line "Additional power Settings" click on it.
> Then, go to "Choose What the power buttons to do (Blue underlined settings in the left side menus), click on it.
> Go to the last four options seen in the new window, and "Uncheck" the first option (( Turn on fast Startup (recommended) )) -->> you must uncheck (remove the selection by click on the box)
> Finally Go to "Save settings" to save what you have done yet.
2. Just restart your PC after all the above steps, you can now completely Shut down your PC.
Bye ...Have a nice day.
For more details, view the below YouTube video:
https://www.youtube.com/watch?v=qNHjn7RiK5A