https://bugzilla.redhat.com/show_bug.cgi?id=2060988
--- Comment #4 from vtq vtq-gnome@outlook.com --- (In reply to fujiwara from comment #2)
Theorically this could not be fixed in IBus side in Wayland since the display coordinate is mamanged by Wayland compositor. You could also see the same issue in GNOME Wayland with ibus module instead of wayland module.
With upstream patches https://codereview.qt-project.org/c/qt/qtbase/+/445920 and https://codereview.qt-project.org/c/qt/qtbase/+/447069 applied to Qt, Qt applications running in native Wayland backend now work properly in GNOME Wayland environment using ibus im-module, showing the window at the correct position. They previously also had this issue, see https://bugzilla.redhat.com/show_bug.cgi?id=2061664.
I don't know if the patches would also fix the issue in Plasma Wayland environment.