I spent today tinkering with the orangepi 5 and debian trixie images. Following your procedure,
the resulting image is not bootable on the OrangePi 5. To me it looks like the file https://dl.sd-card-images.johang.se/boots/2026-01-01/boot-orangepi_5.bin.gz is corrupted: The tmp.img does not seem to have any content at all.