Drag and Drop works only with the right part of the screen

Hi! I am a new KDE user, and I am happy as never before. Sometimes I see some bugs, which I would like to report, but I found it complicated to do correctly on bugs.kde.org, so I decided to start here. Maybe somebody will help me to create a report. Or maybe it is not even a bag.

What is happening: when I try to drag and drop a picture to both Krita and Gimp, it is possible only with the right part of my screen. Actually, it took 3 weeks to realize that I am able to use drag and drop, because I always tried left/center side of the screen.

Both Krita and Gimp are installed from Flatpak, both use X11 turned on in Flatseal.

Distro: Debian 12 Stable
KDE Plasma Version: 5.27.5
KDE Framework Version: 5.103.0
QT Version: 5.15.8
Kernel: 6.1.0-13-amd64 (64-bit)
Graphics Platform: Wayland
Dual-Monitor setup, different system scaling for each monitor (100% and 150%)

I am not sure if it is related to Wayland, QT or some KDE framework, so couldn’t report it properly.