The current nightly build 22.0.1 9/13/22 doesn’t find a lot of files on the squashfs (mostly audio drivers) and fails at that point without a bootable system on the target. When you try to boot the target partition all you get is a grub menu.
downloading an iso from another location could be a solution to your problem. as for me i don’t have the problem mentioned on my side. the iso seems ok to me.
by the way checking md5 of any downloaded iso is a good option.