Looks like the panel icon is only visible when a Papirus Icon set is selected. Otherwise if another icon set is selected it’s on the panel but no icon is displayed.
I’m also with this problem. After the update to gnome 3.32 most of the top panel icons disappeared (with zafiro-icon-theme). Changing to adwaita stills doesn’t show them.
The only icons that appears are the sound/shutdown icon.
Changing to papyrius or flat-remix icon theme shows them.
Gnome will not start after update. Gnome shell coredump found in journalctl.
What’s the full package name for that?