Icons disappearance when update

Hi, everytime "Firefox" (snap version) and "Thunderbird" (snap version) have an update they disappear from the desk (but the link stays).

Also they disappear from "favorite" in xfce4-whiskermenu. (Reported here : panel-plugins/xfce4-whiskermenu-plugin#162)

Create software links on desktop (right click in xfce4-whiskermenu and "Add to desktop") A link with an icon appears on the desktop.

Create software links on desktop (right click in xfce4-whiskermenu and "Add to desktop") A link with an icon appears on the desktop. Update software.

Icons should be still on the link.

Xubuntu LTS 24.04 xfdesktop4 4.18.1-1build3