Some windows have a draggable area that is more than just the titlebar. These are able to be dragged by the mouse pointer fine, however, if you use a touchscreen then you can only drag the window from the titlebar. SOFTWARE/OS VERSIONS Linux/KDE Plasma: OpenSUSE Leap 15.2, x11 (available in About System) KDE Plasma Version: 5.20.90 KDE Frameworks Version: 5.78.0 Qt Version: 5.15.2
This happens both on wayland and x11. The code that should start interactive move is in breeze kstyle
Can confirm on Fedora 42, Plasma 6.4