When you uninstall a package, that has an icon that is marked as extra visible:
* In Ubuntu 23.04 Favorite (icons) are removed right away after a package has been removed (see Ubuntu-*.png) -- This bug also affects Ubuntu 22.04.
* In Ubuntu MATE 23.04 Panel (icons) are NOT removed right away after a package has been removed (see Ubuntu_MATE-*.png) -- This bug also affects Ubuntu MATE 22.04. This bug has nothing to do with snap that is related to the default installed firefox package. It affects any item. For example, you can
** right-click on the Panel and select "Add to Panel" -> "Application Launcher..." and click on "Accessories -> MATE Calculator", and then click on "Add"
** "apt-get remove mate-calc"
Unexpectely, I cold not use ubuntu-bug mate-panel: "This does not seem to be an official Ubuntu package."
$ apt-cache show mate-panel
Package: mate-panel
Status: install ok installed
Priority: optional
Section: x11
Installed-Size: 1684
Maintainer: Ubuntu Developers <email address hidden>
Architecture: amd64
Version: 1.27.0-0ubuntu1
