MacBookPro does not shutdown or restart

The latest update....

I created a Mojave installation USB (current macOS version is Catalina), and I booted the laptop from the USB. In recovery mode, I wiped everything from the SSD.

I then did a clean Mojave installation which went okay. I was able to shutdown / restart without issues in Mojave. After a few shutdown/restart tries, I upgraded to Catalina (Apple > About This Mac > Overview > Software Update).

The upgrade completed without any issues. With this version of Catalina (from Mojave upgrade to Catalina), I am able to shutdown / restart without any issues so far.

Also, I realised that The "Storage" tab of "About This Mac" now shows only one disk, whereas when I had the problem and after doing a Catalina installation (either from the image on the disk or via internet recovery), I always had two disks with the same size; one named as "Macintosh HD" and the other as "Macintosh HD -- Data". I also realised there was another volume named as "Macintosh HD -- Data 1" which was not visible in the GUI but in CLI only when cd into /Volumes. A process called "kextcache" was using this "invisible" volume and not unmounting when shutdown or restart was performed, preventing the OS to power off.

Thanks!

The power-off from the power button or restart with Cmd + Alt + Power keys work, it is only when I try to do it from the GUI.