The Application Dashboard no longer shows proper icons for some types of application.

In the example below:

• GTK-Mixer
• Thunderbird
• Firefox Web Browser
• NVIDIA X Server Settings

As far as I recall: the problem began after a change of theme.

As far as I can tell: the problem is not resolved by preferring a theme such as Breeze.

Any suggestions?

Environment

Operating System: FreeBSD 14.0
KDE Plasma Version: 5.22.3
KDE Frameworks Version: 5.83.0
Qt Version: 5.15.2
Kernel Version: 14.0-CURRENT (64-bit)
Graphics Platform: X11
Memory: 31.9 GiB of RAM
Graphics Processor: Quadro K1100M/PCIe/SSE2