I can confirm this is happening for me too.
I’m using Pureboot+HEADS and installed arch on luks encrypted root partition
Same as above, last thing I see is kexec_core: Starting new kernel. with the caret being static (not flashing). I am able to type the password and hit enter. If I enter it correctly it proceeds to booting. If I enter it incorrectly, it will accept further attempts until I get it right and then proceed to booting. It almost seems as if the prompt is running and behaving as it normally would, its just not getting printed to screen.
I’ve signed up on your GitLab instance to submit this as an issue, I just need to be approved by an admin first (username: wccr)