Untracked files when git status executed on a new folder

Hi all. Today I've had an unexpected behaviour that I'm not sure if is a bug or I'm not doing git best practices... (surely the latest...) The sequence of actions is :

1. create a new subfolder of my local repository branch
2. cd to this new folder, and create a new file
3. execute git status from the new folder

Doing that, the new folder doesn't appear as untracked.

4. cd ..
5. git status
In this case, the new folder appears.

If I create a new folder on the same level that the new one created in step 1, cd into it, and execute git status, the folder created in step 1 appears as untracked.

After step 3 I have executed git commit and git push to the remote, and later another user has realized that the new file was not present.

Please let me know if you understand my explanation, and if it's a bug or just that I'm not as experienced as I'd like with git ;)

THANKS!! Víctor