I'm closing this based on the most recent comment.
adwaita-icon-theme Suggests adwaita-icon-theme-legacy which means it's
not installed by default but it's mentioned in apt's output when using
apt from the command line.
** Changed in: adwaita-icon-theme (Ubuntu)
Status: New => Fix Released
I just found out that they are in the adwaita-icon-theme-legacy
package...
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https://bugs.launchpad.net/bugs/2073533
Title:
Some icons are missing from GNOME's default icon theme
To man