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Occasionally, when opening an app, a duplicate (blurrier) icon will appear in the Plank dock, and the app's normal icon already kept in the dock will not display an indicator.

Blurry duplicate of AppCenter icon

When this happens, said app's window will show a gear icon in multi-tasking view, as shown below, as well as window spread view and the alt-tab switcher as well.

Gear icons over application in Window Spread view

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I've seen exactly the same couple of issues. I can also add that sometimes applications installed from flathub (LibreOffice) can have normal plank icons with no duplicates, but at the same time they have a gear-icon in the multitasking view.

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