'Using "git flow release finish" why merge master into develop not use the release branch?

I have question about git flow operation. I watched the post about the "Release branch". Finally, the release branch merged into master and develop respectively. I also followed the commands, and the commit graph had been correct.

enter image description here

enter image description here

I used gitflow-avh or sourcetree to same operations, but the commit graph was different. Why the master branch merge into the develop branch not use the release branch?

enter image description here

enter image description here



Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source