TW - Plasma6 / X11: cursor jumps while writing text

Hello, since Plasma6 on X11 I have an issue when writing text: All of a sudden the cursor jumps to a different location while writing. Text is somehwat broken afterwards. This happens only on X11, not on wayland. On X11, the systemsettings do not detect the touchpad (not found), while it is visible on wayland. Created already a bug for it: https://bugs.kde.org/show_bug.cgi?id=484753 My best guess is, that this is the reason for the jumping cursor: when the hand comes too close to the touchpad, it reacts different on X11 and wayland. Has anyone else this issue as well? Any ideas? Cheers Axel