Ubuntu Version:
Ubuntu Studio 26.04
Desktop Environment (if applicable):
KDE Plasma 6.6.4 (Wayland session)
Problem Description:
In the Task Manager, new application windows lose their correct application icon and instead display a generic Wayland icon.
This issue occurs across all applications, including KDE system applications (e.g. Security Center / System Settings), not just third-party or Electron apps.
The issue is reproducible whenever an application creates additional windows or toplevel surfaces.
Steps to reproduce:
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Open any application (e.g. Dolphin, Firefox, System Settings)
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Trigger a new window within the same application
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Observe task manager behavior:
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First window appears with correct icon
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New window briefly shows correct icon
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Then switches to a generic Wayland icon
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In some cases, task entries duplicate or replace each other
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Relevant System Information:
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KDE Plasma: 6.6.4
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Session type: Wayland
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Desktop: KDE (Ubuntu Studio)
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Hardware: Intel integrated graphics (no dedicated GPU)
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Display server: Wayland
GIF of Problem:
What I’ve Tried:
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Tried all three alternative widgets
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Grouping set to “By program name”
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Combine into single button enabled
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Tested alternative icon themes (including Breeze)
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Restarted and updated Plasma
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Cleared/reset Plasma configuration related to panel/task manager
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Issue persists across all applications including KDE system apps
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Unable to test X11 session as it makes the OS unable to boot