I’m having a very bizarre issue.
I can confirm that from at least 5.3 to 5.4.4 this node does work, but only if it’s for widgets that aren’t children of other widgets.
If I create a widget at runtime and have it follow my cursor using this node then it works fine.
If the widget is part of another widget, it does not. Even if that widget is an empty canvas panel, as others have suggested.
The canvas slot workaround works as well.