I’m not sure if your issue is the same as mine, but here’s what I’m facing: after rebooting my system, I’m stuck at the LUKS passphrase screen, and there’s no typing bar. This screen stays visible for about five minutes before showing an error.
This response helped me: Install Qubes OS with boot partition and a detached LUKS header on USB - #67 by tonicnapkin
For Qubes 4.3:
add_dracutmodules+=" systemd-cryptsetup "
install_items+=" /root/header.img "