Activate 'Zoom' effect. There are 2 mouse cursors. The more you zoom in - the further appart they are. Operating System: Arch Linux KDE Plasma Version: 5.23.90 KDE Frameworks Version: 5.90.0 Qt Version: 5.15.2 Kernel Version: 5.16.3-arch1-1 (64-bit) Graphics Platform: X11 Processors: 8 × Intel® Core™ i7-8550U CPU @ 1.80GHz Memory: 19.3 GiB of RAM Graphics Processor: Mesa Intel® UHD Graphics 620
Cannot reproduce on Wayland.
Still an issue in plasma 5.25.4. Here is a screen recording for illustration: https://streamable.com/wko1bz
I still had this issue with 5.26, but then I tested a fresh user account and couldn't reproduce. So I started looking at the config files and ~/.config/kwinrc had two sections related to zoom effect - after deleting those and rebooting this issue finally went away.