git-cherry doesn't detect a "copied" commit

Hi,

I'm seeing something odd with git-cherry: it doesn't seem to detect that a commit has been cherry-picked from master branch.

This happens with the systemd git repository (from github) so it should be fairly simple to reproduce.

What I did:

$ git --version
git version 2.6.0
$ git checkout -b foo v210
$ git cherry-pick -x 9ea28c55a2488e6cd4a44ac5786f12b71ad5bc9f
$ git branch --contains 9ea28c55a2488e6cd4a44ac5786f12b71ad5bc9f
master
$ git cherry master HEAD
+ fef60bf34d1b372bea1db2515a8d936386dfc523

so git-cherry tells me that the cherry-picked commit has not equivalent in master, which is no the case.

What am I missing ?

Thanks