I did a brief web search and didn't find anything, so this is offered in case it is helpful.
Use the options/customize menu, choose browse customization groups
The option you need to change is files/dired/dired dnd protocol alist
The values need to be changed to the same as dnd-protocol-alist, used by other windows.
The previous values were dired versions of these functions (dired-dnd-handle-local-file and dired-dnd-handle-file).