Thanks for your efforts.
As it turns out, the printing problem only occurs when sending a test page to the printer from the printer setup dialog. It's a replicable error from both CORE and PRO on multiple computers. However, when I print from an application, the job prints!
Because this works out-of-the-box on PopOS! and Linux Mint, I'm going to assume Zorin has some extraneous data being sent with the test page.
When printing the test page, the error code shown in the job log is 017-734. Xerox's website says:
Fault Code 017-734: IPP Data Error
Product support for: VersaLink C500_C600 Family, VersaLink C500, VersaLink C600
Article Id: 2106127.html | Published: 10/17/2019
Syntax error, usage of undefined command, parameter error, damage of the file, or internal error of the decomposer has occurred during the decomposer process of a direct print job that used IPP in its network protocol.
Try Printing a Different Print Job to See if the Same Error Occurs. Take Action Depending on the Result.
For Apple OS, Use a Different Print Method (Print Driver or Utility) Not Internet Printing Protocol to Print to the Device.
Re-install Drivers on a Computer With Windows 8.8.1 or 10 for a Network Connection.