lomiri: app icons in the launcher's drawer sometimes don't appear (e.g. directly after package installation)

How to reproduce this issue:

• Install Debian 13 minimal on physical hardware (e.g. a notebook) or a VM, and run apt install lomiri. Reboot.
• Login into Lomiri
• click on the logo top-left and open the launcher's drawer
• look at the icons and app names, all should be visible as you'd expect things to be
• Install some package that adds a .desktop file to /usr/share/applications, such as xterm

What you will observe:

• The xterm name shows app in the launcher (actually xterm comes with two .desktop files, so to app entries)
• but the xterm icon will not be shown immediately after installation
• logout/login
• Icon of xterm apps are shown

What should happen:

• after app installation app name and app icon should appear immediately

Check also:

• There is a report in Lomiri upstream, that a similar thing is happening with .desktop files that have NoDisplay=true
• Also assure that when uninstalling apps, entries are properly removed from the launcher's draw and the launcher