drag and drop in GUI applications is a known issue under Wayland.
It wouldn’t be a problem for Ardour, if you could somehow rearrange processors other than by dragging them. Dragging a processor doesn’t work (for me) and I couldn’t find any keybindings or stuff in the Lua API to rearrange a single processor (e.g moving it up or down).
If I want to drag a processor I see it pop up for a split second but then the highlighting resets…
Not sure how to provide better information at this point unfortunately…
Hyprland. From what I understood some window managers will try to focus the active window, which will reset the drag/drop. nofocus is what the rule is called in Hyprland.