newest release branch not showing up in automerge

[Satish Panpatte]

I have created a release branch QS1704 from master and release branch QS1705 from QS1704. I have enabled automerging ON. I created one feature branch "feature/xyz-abc" from release/QS1704. I raised a pull request from feature branch to release QS1704 branch. When I click merge button. Merge flow I see is feature->QS1704->master where as I was expecting feature->QS1704->QS1705->master (since I have enabled automerging). Can you please help me why QS1705 is not shown in merge flow?