'git log' doesn't keep log of un-removed and then renamed directory

In the FreeBSD ports tree I restored the previously removed directory 
math/dynare:

1. git checkout 3fb72e318f7be~1 -- math/dynare

2. git mv math/dynare science/dynare

3. rm -rf science/dynare && cp -r science/dynare.new science/dynare

4. git add science/dynare

5. git commit science/dynare


After this 'git log science/dynare' only shows my last commit, and not 
the previous history of 'math/dynare' that existed before its removal.


The above sequence of commands should have kept and migrated the history 
of math/dynare to science/dynare, but it didn't.


The corresponding subversion command sequence keeps history.


Yuri