SUMMARY
This is a really minor issue, but I've noticed that the corners of captured active windows (Capture Active Window) look worse than the same window captured via Capture Rectangular Window.

First attachment: Konsole in Breeze theme captured via Capture Active Window.
Second attachment: Konsole in Breeze theme captured via Capture Rectangular Window (wallpaper set to #ffffff for better visibility).
Third attachment: Konsole in Breeze Dark theme captured via Capture Active Window.

STEPS TO REPRODUCE
1. Set Breeze theme
2. Capture active window via Spectacle

OBSERVED RESULT
Top window corners look worse than they do normally. 

EXPECTED RESULT
Top window corners look the same as they do usually.

SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 42
KDE Plasma Version: 6.2.90
KDE Frameworks Version: 6.10.0
Qt Version: 6.8.1
Kernel Version: 6.13.0-0.rc6.20250109giteea6e4b4dfb8.51.fc42.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 5800U with Radeon Graphics
Memory: 30.7 GiB of RAM
Graphics Processor: AMD Radeon Graphics