Unable to check new branch - impossible to git

Question

I am trying to create a playbook where I can check any branch just by changing a variable. The git section in the playbook:

- name: Clone repository
  git: 
    repo: "{{ repo_url }}"
    dest: /some_path
    key_file: some_path_to_a_file
    version: "{{ repo_tag }}"
    force: yes

At first I used repo_tag = master, and it worked. Then I created a new branch called dev and tried with repo_tag = dev. It says that he cannot verify this tag. The problem is that the module does not retrieve data before performing the check.

What am I doing wrong in my game?

Edit: As a temporary workaround, I just delete the repository folder before cloning, but this forces the clone even when it is not needed.