Comment 27 for bug 2062988

apparently the desktop iso uses the subiquity binary packed in the ubuntu-desktop-bootstrap snap which contains the ubiquity version from the LTS day. that's why injecting subiquity edge snap to the desktop iso doesn't work. also the ubuntu-desktop-bootstrap snaps in daily desktop images are pointing to the old subiquity binaries, so even the candidate snaps for ubuntu-desktop-bootstrap doesn't have the fixed subiquity.

you can see my question and the answers at github:
https://github.com/canonical/ubuntu-desktop-provision/issues/753