I went through a bunch of testing on this. I set up a RPi with Bullseye and set
up the queues I needed to test it with. I attempted to make sure there was
package parity, in spite of having amd64 vs armhf. I can print from the Pi with
color and duplex.
I completely tore down the CUPS printing
Subject: printer-driver-pxljr: Loss of duplex on Dell 2130cn with pxlcolor
Package: printer-driver-pxljr
Version: 1.4+repack0-6
Severity: important
Sometime since buster, but probably bullseye, my Dell 2130cn stopped printing
in duplex. I don't use the printer much and I upgraded from buster to
2 matches
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