This situation: I created an issue (user story) under project X. In the creation screen, for the Sprint field, the autocomplete function offered me all kinds of sprints belonging to other boards/projects. To find out why this would be handy/logical, I added selected an existing sprint of project/board Y.
When everything was saved and I went to my board (linked to project X), I saw the sprint there and thought it belongs to my board (just with the same name). However when deleting the sprint, project Y lost its sprint. So it was the same sprint, not just in name.
Assuming I'm missing something and it's not a bug: what's the rationale of using / being able to delete a sprint belonging to someone else's board/project?