Brother two-sided printing issue in Silverblue 40 & 41

The printer is connected using overlaid printer-driver-brlaser 6 (printer-driver-brlaser-6.2.6-4.fc41.x86_64). One sided printing works fine. When printing two-sided the odd pages print what looks like barcodes (attached)

I got the same results on Silverblue 40/41 and Atomic Sway 41 with two Brother printers (HL-L2310D and HL-L2312D) and two different print servers (p910nd on OpenWRT and Synology Diskstation).

The printers work fine with the same setup and a Debian 12 pc with printer-driver-brlaser 6.

Any ideas what the reason might be?

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This is weird. I have a newer gen Brother HL-L3290CDW and double sided printing still works as normal AFAICT on F41 using out of box drivers.

Are you using your printed wired or wireless?