Comment 2 for bug 2028213

Seems the problem is two copies of each snap in the one ISO:

minimal.standard.live.squashfs: /var/lib/snapd/seed/snaps

4.0K bare_5.snap
74M core22_817.snap
67M cups_980.snap
246M firefox_2916.snap
47M ghostscript-printer-app_769.snap
486M gnome-42-2204_120.snap
92M gtk-common-themes_1535.snap
39M gutenprint-printer-app_702.snap
62M hplip-printer-app_788.snap
4.1M ipp-usb_101.snap
46M ps-printer-app_1214.snap
54M snapd_19457.snap
452K snapd-desktop-integration_83.snap
13M snap-store_959.snap
129M ubuntu-desktop-installer_1153.snap
1.4G total

minimal.squashfs: /var/lib/snapd/seed/snaps

4.0K bare_5.snap
74M core22_817.snap
67M cups_980.snap
246M firefox_2916.snap
47M ghostscript-printer-app_769.snap
486M gnome-42-2204_120.snap
92M gtk-common-themes_1535.snap
39M gutenprint-printer-app_702.snap
62M hplip-printer-app_788.snap
4.1M ipp-usb_101.snap
46M ps-printer-app_1214.snap
54M snapd_19457.snap
452K snapd-desktop-integration_83.snap
13M snap-store_959.snap
1.2G total

The snaps haven't gotten any bigger compared to legacy, only duplicated.