https://bugs.kde.org/show_bug.cgi?id=498533

            Bug ID: 498533
           Summary: Desktop icons is ignored
    Classification: Plasma
           Product: plasmashell
           Version: git-stable-Plasma/6.2
          Platform: Debian unstable
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Panel
          Assignee: plasma-b...@kde.org
          Reporter: piotr.panas...@outlook.com
                CC: niccolo.venera...@gmail.com
  Target Milestone: 1.0

SUMMARY
Icons not properlly bounded to runnig program instance i.e.
when one is using freeGLUT software such as mupdf even if icon is configured
after executing program plasma panel shows other icon then configured.
Behaviour is seen also with other programs when icon is set individually i.e.
when one is run chromium with custom icon and layout.
It is seen also then one have emacs client server relation, when emacs client
windos is started form panel icon plasma creates new icon

STEPS TO REPRODUCE
MuPDF
1. Install
2. set custom icon
3. check if icon is persented under right button menu
3. start any pdf document
3. Observe icon on the dash panel 
Worth to notice that FreeGLUT has no portable way of specifying an application
icon, so mupdf-gl on
x11 or wayland does not even try to set an application icon.

I believe your issue is with either KDE or a KDE/FreeGLUT interaction, where
window manager is failing to set the icon you want for mupdf-gl's window.
-----
Chromium
1. Install
2. configure custom layout by flags:
'--app=https://bugs.kde.org --user-agent=Mozilla/5.0 (Windows NT 10.0; Win64;
x64; rv:115.0) Gecko/20100101 Firefox/115.0' %U
3. Chage icon for custom one
4. Check the behaviour on the dash
OBSERVED RESULT
- muPDF doesn't even tries to set correct icon, there is only one X seen
- Chromium, even at start shows custom icon, after system upgrade icon is
changed to default icon for chrome/ium.
- Emacs, even on the plasma panel there is emacs client icon plasma creates new
one for and all instanses cumulates under this new icon instance. 
EXPECTED RESULT
- muPDF icon shall be also present on plasma panel
- Chromium custom icon shall be always shown if started from custom icon occur
- Emacs custom client icon shall be energied when window is created and present
on plasma desktop.
SOFTWARE/OS VERSIONS
Operating System: Debian sid
DE Plasma Version: 6.2.5
KDE Frameworks Version: 6.8.0
Qt Version: 6.7.2
Kernel Version: 6.8.12-amd64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 PRO 4750U with Radeon Graphics
Memory: 15.0 GiB of RAM
Graphics Processor: AMD Radeon Graphics

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