Latte-dock is primarily intended for the Plasma desktop. That may be one reason why you have issues. The major reason, however, could be that you now may be running the Wayland display server rather than the traditional Xorg display server. You can confirm that from the output of echo $XDG_SESSION_TYPE.
If you are running Wayland, then switching to an Xorg session probably will allow you to run Latte dock again.
Latte-dock is primarily intended for the Plasma desktop. That may be one reason why you have issues. The major reason, however, could be that you now may be running the Wayland display server rather than the traditional Xorg display server. You can confirm that from the output of
echo $XDG_SESSION_TYPE.If you are running Wayland, then switching to an Xorg session probably will allow you to run Latte dock again.