just wanted you to know. I had the same issue when I just updated my BIOS to 1302. What I did was set the GPT reovery policy in the boot options to Auto Recovery. After that my drive booted normally again.
I hope that helps you all as well.
I have an Asus Z390-A with the latest BIOS 1401. Just built it several days ago.
I have a WD Elements 4TB USB external drive that I just hooked up to transfer files to my new build.
I am now getting the GPT Corruption error too.
Prior to hooking up the WD the PC started up fine with no errors.
I did get it to finally boot by loading bios defaults. But not really sure if that even did anything. It was at the defaults already!
Hoping Asus does something about this because the issue still remains unresolved.