Start menu appears far above the task bar. Known issue? Wayland/fractional

Using Gnome Arch. Installed KDE Plasma 6 from the official repository. The monitor is 4K and using 150% scaling. Wayland. When I click the start button the menu appears like the picture below. Is this a known issue?

Also, when a window is maximised, part of it goes below the task bar. Below is the screenshot of LibreOffice Writer. The status bar is below the task bar. For some reason I get 422 error when I attached the screenshot. So I uploaded it to Imgur instead.