It is wrong to put the onus on the print driver.
I have a Xerox Phaser 6140DN and a Versalink C400. Both have automatic duplex. Both work well and as expected with all other programme I have from Apple, Microsoft etc.
On the Phaser 6140DN the print dialog in Affinity Publisher offers the option to print on two sides, but not how to flip the page. The second side is inverted.
With the Xerox Versalink C400 I am not given the option print on both sides. It is as if the printer does not have duplex.
It looks as if the problem is how you access the print driver and not the driver itself.
