Sprint(s) showing on board(s) they are not part of by moving issue

Planned/future sprints are showing up in other teams boards who are not recognizing the sprint and closing them on the other team.

Prerequisites:

Each project has a PM who looks after the backlog of their project, but they both have admin access between the two projects.

• Project A (PRJA)
  • Contains Component 1
  • Contains Issue PRJA-1
  • Contains Issue PRJA-2
• Project B (PRJB)
  • Contains Component 2
  • No initial issues
• Agile Scrum Board 1
  • Filter: project = "Project A" and component = "Component 1"
• Agile Scrum Board 2
  • Filter: project = "Project B" and component = "Component 2"
  • Contains a sprint called Halloween Sprint

Steps to reproduce:

1. Create a sprint in Board 1 called Sprint 1
   • Add PRJA-1 to Sprint 1
   • Add PRJA-2 to Sprint 1
2. Move issue PRJA-2 to Project B (PRJB) / Component 2
   • PRJA-2 is now PRJB-1
3. Sprint 1 will now appear in Board 2
4. Move PRJB-1 to Halloween Sprint in Board 2
5. Sprint 1 will still appear in Board 2 and show as empty (even though there is 1 issue in Sprint 1 on Board 1
6. The PM for Project B is able to close out Sprint 1 on Board 2 even though the sprint doesn't match any conditions to show on Board 2.