rename tracking and file-name swapping

Hi everyone. Does rename tracking recognize two file names being swapped?

% ls -l
total 24
-rw-rw-r--   1 wavexx  wavexx  5952 Sep 13 13:09 file1.txt
-rw-rw-r--   1 wavexx  wavexx  3330 Sep 13 13:09 file2.txt
% mv file1.txt file3.txt 
% mv file2.txt file1.txt
% mv file3.txt file2.txt
% git add file1.txt file2.txt 
% git diff -M --stat --cached
 file1.txt |  150 +++++++++++++++++++++++-------------------------------------
 file2.txt |  150 +++++++++++++++++++++++++++++++++++++-----------------------
 2 files changed, 150 insertions(+), 150 deletions(-)

I would expect at least to see

  file1.txt => file2.txt
  file2.txt => file1.txt

if the contents are totally unchanged.

Am I doing something wrong?

Thanks