Probably you are hitting this bug
https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1971242
The bug is fixed upstream in CUPS 2.4.3 and later and I have created 2
Stable Release Updates (SRUs) for Ubuntu Jammy (CUPS 2.4.1) and Lunar
(CUPS 2.4.2). So you could try these fixes and they could
Package: cups
Version: 2.4.2-3+deb12u1
Severity: important
Dear Maintainer,
here is the same problem with a Kyocera ECOSYS P5021cdw that works
perfectly in Debian 11, but with the same settings after the upgrade to
Debian 12 it is only possible to print in greyscales.
Every settings are set
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