Login fails when preceded by incorrect password

WORKAROUND: After typing an incorrect password, click Cancel, then click your name, then enter your password again.

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When on GDM, if you enter the password incorrectly and then enter the password correctly, the GDM GUI will disappear but you won't be logged into the session - you're left hanging on a purple screen with a cursor and have to hard shutdown.

LP_1766137 (see from 15:27:15)
LP_1766137_log_2

Unfortunately I don't have a device to SSH into the session from so I'm not sure how to get the unabbreviated logs?

The Ubuntu bug is here.

gnome-shell 3.28.1-0ubuntu1
gdm3 3.28.0-0ubuntu1

_{Ubuntu's Sebastien Bacher reckoned this should be filed against GNOME Shell rather than GDM.}