Todo is not dismissed when approving a merge request

Steps to reproduce:

• On a repository with merge approvals required:
• User A, creates a new Merge Request
• User A assigns User B to MR (assign to issue, not as required approver)
• A todo is created for user B
• User B approves Merge Request
• Expected: TODO should be automatically dismissed, as it is when the user comments or reacts with a emojii.
• Actual: Todo remains pending for user B