postmarketos-mkinitfs-hook-debug-shell: shell doesn't get killed
When you're in the debug shell and type
pmos_continue_boot, then the boot process continues but e.g. during the openrc output you can still see that the shell is active. This is especially noticeable when you get to the getty login prompt as the debug shell still interferes with getty and leads to interesting behavior.
Pressing Ctrl-D during the boot process terminates the shell and makes getty / the serial console behave normally.
Tested on fairphone-fp2.