It looks like the answer is because yaru-theme-gnome-shell implements some of what upstream implements in gnome-shell (data/theme/gnome-shell-sass/widgets/_calendar.scss). An upstream fix in 'gnome-shell' sometimes needs to be downstreamed to Ubuntu in the 'yaru-theme' package.
It looks like the answer is because yaru-theme- gnome-shell implements some of what upstream implements in gnome-shell (data/theme/ gnome-shell- sass/widgets/ _calendar. scss). An upstream fix in 'gnome-shell' sometimes needs to be downstreamed to Ubuntu in the 'yaru-theme' package.