If I create a "Master Board" and a "Team Board" of the type Scrum, and I catch an issue in both boards, it seems possible to create Sprints in either of the boards and assign the issue to the planned Sprints in each board. The two boards does not seem to recognize the both the Sprints until one have started the Sprint in either of the board.
I.e. It seems to be some kind of race. The first one to start the Sprint of his board wins the battle and that Sprint will be visible in both Boards.
I can not see the reason behind. Why are the Sprints local to the board unless started?! I think it is a problem during search of issues as well. You have no qlue to the planning unless browsing via the Board.