In my dock both the Thunderbird and “Applications” icons are missing.
When I change the icon theme, the icons of Thunderbird and “Applications” are also missing in other popular themes (arc, breath, adwaita).
I use the Breeze icons theme.
However the Thunderbird icon is not missing in the custom Papirus theme (but this is not the original Thunderbird logo)
- I tried reinstalling Thunderbird, which did not solve the issue.
- I tried running
gtk-update-icon-cachein terminal, this also did not solve the issue.
The original Thunderbird icon is visible in the start menu and in Albert menu.