Why dont you get the Raspbian Lite OS 64 image here: https://downloads.raspberrypi.org/raspios_lite_arm64/images/raspios_lite_arm64-2022-09-26/2022-09-22-raspios-bullseye-arm64-lite.img.xz
Then, flash the SD card with that.
Add your ssh.txt blank file to the boot directory, and userconfig.txt if you have one for preconfigured Pi or any other user.
Configure the Pi with all options you need before installing Anthias, by using sudo raspi-config.
Once you are ready, simply run the command:
bash <(curl -sL https://install-anthias.srly.io)
This works just fine every time I do it…
There might be some issues with the Pi Imager image that is pulling, not sure, I dont troubleshoot much using that, but you need to try and remember that there are alternative installation methods just like the GitHub page says…