SUMMARY
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Disclaimer:  I'm in a live environment. Using KDE Neon Unstable ISO(12/02/2024).

When I apply night color on my laptop, it only affects the laptop screen, not the external monitor attached to it. I should mention that this can't be a case of hardware issue as I use Plasma 5.27 on the same setup and Night color is applied to both. 

STEPS TO REPRODUCE
1. Apply Night color via any method(Always On or Time bsaed)
2. 
3. 

OBSERVED RESULT
Night Color only applies to laptop screen.

EXPECTED RESULT
Both screens should be affected.

SOFTWARE/OS VERSIONS
Operating System: KDE neon Unstable Edition
KDE Plasma Version: 6.0.80
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.1
Kernel Version: 6.5.0-17-generic (64-bit)
Graphics Platform: Wayland
Processors: 12 × Intel® Core™ i7-9750H CPU @ 2.60GHz
Memory: 7.6 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics 630
Manufacturer: HP
Product Name: OMEN by HP Laptop 15-dc1xxx

ADDITIONAL INFORMATION
External Monitor: Dell E2218HN