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Icon Task Previews disabled

Icon preview in the taskbar are disabled why in Manjaro are enabled? Can I enable it?

These are disabled on purpose.
You would need to turn back on the global hinting setting, as well as group popup setting in the task manager.

How can I turn back on the global hinting setting?

Open ~.config/kdeglobals and add or change the following:

[Main] ShowToolTips=true