While I wholeheartedly agree that we urgently need an official fix, I also want to point out that
gsettings set org.gnome.shell.extensions.dash-to-dock transparency-mode FIXED
is an effective workaround for me. On my Cosmic, I have never seen the dock again on the lock screen. I'm using vanilla Ubuntu docker with no dash-to-docker or any other customization to the dock.
While I wholeheartedly agree that we urgently need an official fix, I also want to point out that
gsettings set org.gnome. shell.extension s.dash- to-dock transparency-mode FIXED
is an effective workaround for me. On my Cosmic, I have never seen the dock again on the lock screen. I'm using vanilla Ubuntu docker with no dash-to-docker or any other customization to the dock.