IPP Everywhere generic CUPS driver doesnt work with lprint

[Oberonc]

Test page is printed successfully from the web interface of lprint. a PNG file is printed successfully from the command line using lprint.

Printer: Zebra ZD420 OS: Ubuntu 20.04 LTS PAPPL: 1.2.1 (latest release) lprint: latest from git

When I add IPP Everywhere generic driver I encounter 2 problems:

1. After adding the printer when I try to print a test page it crashes (I run it again with valgrind for extrq information) valgrind.txt
2. When I try to print a PNG file using CUPS (same PNG that can be printed using command line lprint) I get an error: badrequest.txt