When I drag a card from Kanban A to Kanban B, if I drop the card at Kanban B header, it would cause the following error: (then the kanban board will not working any more)
and its is easily replicable the issue at the official docs demo, preview of "external drag & drop" section:
(just drag and drop the cards to another kanban board header)
for my own scenario is I had to separate 'backlog' column to another kanban board because I want different layout:
So, is there any way to prevent the issue above or is there some kind of work around if I want this layout without having 2 different kanban board?