I have updated yaru-theme from focal-proposed. I confirm that together with gnome-shell-extension-ubuntu-dock previously updated from proposed this fixes the issue for me in focal.
gnome-shell-extension-ubuntu-dock (68ubuntu1~20.04.1) yaru-theme (20.04.7)
Many thanks to everyone involved!
I have updated yaru-theme from focal-proposed. extension- ubuntu- dock previously updated from proposed this fixes the issue for me in focal.
I confirm that together with gnome-shell-
gnome-shell- extension- ubuntu- dock (68ubuntu1~20.04.1)
yaru-theme (20.04.7)
Many thanks to everyone involved!