<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=28762) </details> <!--IssueSummary end--> ### Summary Changing issue board of a subgroup to milestone from a project, save the change. But the milestone is not switched. ### Steps to reproduce 1. Set-up a Group > Sub-group > Project. 2. Create a Milestone at the top Group level. 3. Create an issue at the Project level and assign a milestone from the top Group level. 4. In the Project, view Issue Boards 5. Edit the Board view to change the Board Scope> select a Milestone from the top Group level > select 'Save changes' ### What is the current *bug* behavior? The milestone is never switched ### What is the expected *correct* behavior? The milestone should be switched. ### Relevant logs and/or screenshots  ### Effected customer Zendesk: https://gitlab.zendesk.com/agent/tickets/121476