Hi!,
I have the exact same problem here. It happen on encrypted nvem root partition with the last kernel. Initramfs stuck before asking decryption password (it is impossible to get another TTY).
I thought it was my home-made Debian installation, by the way I downloaded official image, made installation with reform scripts and everything worked as expected, But After update the system problem occurs.
With the last system on SDCard I can boot my system decrypt my luks container an mount all my partitions without problem.
Regards,