With initrd image created by dracut 20.1 (installed today), on boot, the
password prompt for decrypting is not visible on a normal boot. This makes
booting impossible. This happens for kernel 4.9.6 (installed today) as well as
4.9.4 that was previously working. So the problem appears to be the initrd
image. I do not have the old images anymore, as they're overwritten without
backup after the new kernel is installed.

This is with a regular plymouth boot. I'm not sure how to turn the plymouth
boot off and see the regular boot messages.

With "single" at the end of the kernel command-line, the prompt does appear and
I can boot into my system.