task list checkboxes are disabled for milestones

I am using Gitlab CE 8.1.2.

I can use Markdown syntax in a description to create task list like

- [ ] Task 1
- [ ] Task 2

They get rendered properly as HTML checkboxes no matter if I use them in a description of an issue or a milestone. But while I am able to toggle them when used in issues, they are created read-only (disabled HTML attribute) for milestones.

Is this behavior intended or might there be a bug? IMHO it would be very useful to have toggleable task lists on milestones as well.