Bug report : bad filter-branch (OSX only)

Hello,

Seem to be a bug.

OSX 10.10.3 git 2.3.6 HFS+ case-sensitive

How to reproduce : Step 1 : git clone https://github.com/begeric/FastParsers.git Step 2 : cd FastParsers/ Step 3 : git filter-branch --env-filter 'if [ 0 = 1 ]; then echo 0; fi' -- --all

Result on OSX :
Rewrite 65df7c5ac1ed956252b07b8c911ad7eba0a15c2b (206/206)
Ref 'refs/heads/experiment' was rewritten
Ref 'refs/remotes/origin/experiment' was rewritten
WARNING: Ref 'refs/remotes/origin/experiment' is unchanged
Ref 'refs/remotes/origin/master' was rewritten

Result on Debian :
Rewrite 65df7c5ac1ed956252b07b8c911ad7eba0a15c2b (206/206)
WARNING: Ref 'refs/heads/experiment' is unchanged
WARNING: Ref 'refs/remotes/origin/experiment' is unchanged
WARNING: Ref 'refs/remotes/origin/experiment' is unchanged
WARNING: Ref 'refs/remotes/origin/master' is unchanged

Do you have any thoughts on this ?

Thanks.