https://bugs.kde.org/show_bug.cgi?id=498089

            Bug ID: 498089
           Summary: Task Manager no longer shows windows after plasmashell
                    restart on kwin_wayland
    Classification: Plasma
           Product: plasmashell
           Version: 6.2.4
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Task Manager and Icons-Only Task Manager widgets
          Assignee: plasma-b...@kde.org
          Reporter: j...@jchw.io
                CC: qydwhotm...@gmail.com
  Target Milestone: 1.0

Created attachment 176996
  --> https://bugs.kde.org/attachment.cgi?id=176996&action=edit
Logs from the last invocation of plasma-plasmashell from journald.

After restarting Plasmashell, the Task Manager widget no longer shows any
tasks. It can still launch applications, but it will appear as if no windows
are open at all times. Changing the options for exclusion (e.g. "Show only
tasks" options) to any combination does not seem to have an impact. Restarting
plasmashell again did not seem to have an impact.

STEPS TO REPRODUCE
1. systemctl --user restart plasma-plasmashell

OBSERVED RESULT
Task Manager widget is unable to show open windows.

EXPECTED RESULT
Task Manager should show open windows.

SOFTWARE/OS VERSIONS
Operating System: NixOS 25.05
KDE Plasma Version: 6.2.4
KDE Frameworks Version: 6.9.0
Qt Version: 6.8.1
Kernel Version: 6.11.9 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 9 7940HS w/ Radeon 780M Graphics
Memory: 27.2 GiB of RAM
Graphics Processor: AMD Radeon 780M

ADDITIONAL INFORMATION
Log file of last plasma-plasmashell invocation attached.

My NixOS configuration for KDE is open source but there is probably not much of
interest in it. Most likely if there is a bug in the set up, it is probably
something to do with the way NixOS has the systemd units configured. I should
be able to debug further if the issue is a NixOS-specific problem.

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