No Colors in the Plasma Applet Event Calendar

[nix-tux]

The Event Calendar plasma applet does not show the different colours of the individual calendars - in my case red and green - and the display remains black and white. The same happens with all other widgets such as Digital Clock.

Appearance: Breeze dark

Colour scheme: Breeze dark

Plasma style: Breeze (follows the colour scheme)

What can I do?

Operating System: KDE neon 5.27
KDE Plasma Version: 5.27.8
KDE Frameworks Version: 5.110.0
Qt Version: 5.15.10
Kernel Version: 6.2.0-33-generic (64-bit)
Graphics Platform: X11
Processors: 8 × 11th Gen Intel® Core™ i5-1135G7 @ 2.40GHz
Memory: 15.4 GiB of RAM
Graphics Processor: Mesa Intel® Xe Graphics
Manufacturer: Notebook
Product Name: NS50MU
System Version: Not Applicable