[Printing-architecture] automatically detected printers and duplex printing

Hi list,

I'm not sure if this is the right list - if not, I hope someone would be 
so kind as to point out where to ask this.

At my (small, 10 persons) office, we have several Linux machines with 
printers connected, most of them being Ubuntu 22.04, some Ubuntu 23.04. 
They all used to print through autodetection - cups-browsed.

Since some time (dunno when exactly), there is a problem with duplex 
printing: auto detected printers won't print duplex. I have to add the 
printers manually to get them to print duplex.

What am I doing wrong? What should I do to debug?

Best regards,

Valentijn