PCI; 8086:1916:103c:80fd
Class: 03-00
Vendor: Intel
Name: Skylake GT2 [HD Graphics 520]
I have confirmed that this is a regression in the kernel.
The reason this does not show up as an error with Ubuntu 20.04 but is one on Zorin OS 16, even though Zorin OS is based on Ubuntu 20.04 is because Zorin 16 uses the Ubuntu 21.04 kernel (thereabouts, anyway)...
And sure enough, this graphics card does not work properly on Ubuntu 21.04, either.
The only solution I can see for installing Zorin OS 16 is to install Zorin OS from Command Line only (Or if the Ubiquity installer works under the Safe Graphics option to disable modesetting), then immediately install the stable 5.8 kernel.
Remove the 5.13.0-30 kernel; then boot normally and lock the 5.8 kernel in.
Another solution may be to install the Ubuntu 20.04 OEM kernel.