Fedora icon gone from the panel after upgrade to F40

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I’ve upgraded a couple of laptops to Fedora 40. On one of them, the icon to the very left in the panel is the stock KDE/Plasma icon (three dots and a greater than sign) rather than the fedora Icon it had in F39, and which is shown on the other. There are certainly differences which I would assume irrelevant for this. The one misbehaving is e.g. normally connected to an external large monitor. But I can’t imagine what I may have done to cause this difference.

Does anyone have a guess what might cause this?

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I don’t know if it is related but I’ve found that since KDE moved to Qt6 icon themes must be “Qt6 compatible”, otherwise some icons aren’t shown.

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Thanks for the suggestion. That could have been an explanation if it wasn’t for the fact it only happens on one machine. I have not changed any theme from the defaults (that I am aware of).