Issue when installing additional packages in vscode-fhs


So I installed vscode-fhs through home-manager with the following:

        vscode = {
          enable = true;
          package = pkgs.vscode.fhsWithPackages (ps: with ps; [ cmake clang tmux zsh]);

I wanted to be able to use tmux as internal terminal and clang-format with the clang-format extension.
When trying to format the extensions complains about not finding clang-format and I am unable to use tmux as vscode does not show any terminal profile.

Is there a way to enter the fhs in which vscode run to check what is happening ?