Comment # 16 on bug 1233373 from Antonio Feijoo

(In reply to M Fredericks from comment #8)
> So I am not too surprised about --watch (without knowing what it is doing
> exactly) but I hope it is started during boot using --plymouth although
> "systemctl cat systemd-ask-password-console.service" does not show that.

If you boot with plymouth enabled, the service activated is
systemd-ask-password-plymouth.service, and if it's necessary any password
request after switching root, there is also a hanging process
(`/usr/bin/systemd-tty-ask-password-agent --watch --plymouth` in this case).

(In reply to Marcus Rückert from comment #14)
> well either we hard require plymouth or the code should be able to handle
> missing plymouth.

FTR, there was a regression in Tumbleweed this week related to the plymouth
update, but this issue does not have anything to do with plymouth, it's
expected behavior.