Nightlies require a hard reboot after the installer to boot
All of the nightlies I've recently put on to an SD card all have the same problem where the installer (wifi, timezone, username) appears to work fine, but then the screen goes black with a blinking cursor and stays there forever (or at least hours when I tested). On doing a hard power cycle it then boots fine, skipping the setup correctly.
It's being seen by other people, as seen on the Matrix channel and at: https://toot-lab.reclaim.technology/@djsundog/106800650386989011
I definitely have this with the nightlies between Aug 8, 2021-Aug 20,2021 although I'm sure I saw it on earlier ones, too. I just don't have the dates for those.