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.
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: /github. com/canonical/ ubuntu- desktop- provision/ issues/ 753
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