That's surprising. I never experienced that. All I do is format USB stick with FAT32, copy files from ISO and it just works.
the image was built using this repo [2] and this command: ./build.sh -i dl/alpine-standard-3.19.0-x86_64.iso -p min -s 0.3
[1] https://ocv.me/asm.usb.xz [2] https://github.com/9001/asm