How to create the branch from a specific commit in a different branch

I have made several commits in the master branch and then merged them to the dev branch.

I want to create a branch from a specific commit in the dev branch, which was first committed in the master branch.

I used the commands:

git checkout dev
git branch  <branch name> <commit id>

However, this creates the branch from the master branch, not the dev branch I expected. The commit id is same in the master branch and dev branch. So, how can I distinguish same commit id in a different branch?

PS: I made an example at GitHub.

I used the commands:

git checkout dev
git branch test 07aeec983bfc17c25f0b0a7c1d47da8e35df7af8

I expect that the test branch contains aa.txt, bb.txt, and cc.txt. However, the test branch only contains aa.txt and cc.txt. It most likely created the branch from the master branch.