Tray icon menu not rendered on Debian testing with KDE Plasma

[MadMass]

Describe the bug
I updated my Debian to testing, and I'm using KDE Plasma with default theme. The redshift tray icon is shown correctly in the tray bar, and redshift works. But when I'm clicking the tray icon, the drop-down menu is displayed empty, only the border are visible. The items are still in the menu and I can click them since I remember where each line was.
I'm not sure if it's an issue related to redshift or to KDE Plasma.

• I have checked the FAQ and my issue is not mention there.

To Reproduce
Steps to reproduce the behavior:

1. Click on redshift tray icon in KDE Plasma desktop environment
2. The dropdown menu opens, but is visually empty

Expected behavior
Dropdown menu contents should be rendered

Error output/logs/screenshots

Software versions (please complete the following information):

• OS: Linux 6.12.17-amd64
• Redshift version: redshift 1.12
• Distribution: Debian
• Redshift installed from: apt repositories