git annex adjust --unlock seems to cause migration of a file to another backend

Please describe the problem.

Interestingly, on my first attempt I had two files which migrated from MD5 to MD5E backend, but may be I have done some steps differently which provoked also also utils/test/test_data.tar.gz to get to the same destiny (actually later replicated on a fresh clone). I am also a bit confused why git diff reports change in the symlink if file is already a real file (I guess all the smudging magic)

Please provide any additional information below.

# If you can, paste a complete transcript of the problem occurring here.
# If the problem is with the git-annex assistant, paste in .git/annex/daemon.log
(git)smaug:~exppsy/freesurfer-upstream2[master]git
$> git status
On branch master
Your branch is up-to-date with 'origin/master'.
nothing to commit, working directory clean

$> git annex adjust --unlock
adjust
Checking out files: 100% (468/468), done.
Switched to branch 'adjusted/master(unlocked)'
ok
git annex adjust --unlock  23.70s user 35.25s system 32% cpu 2:59.41 total
changes on filesystem:
 vtkutils/vtkKWRGBATransferFunctionEditorTester-scalars.mgh | 2 +-

$> git status
On branch adjusted/master(unlocked)
Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git checkout -- <file>..." to discard changes in working directory)

        modified:   vtkutils/vtkKWRGBATransferFunctionEditorTester-scalars.mgh

no changes added to commit (use "git add" and/or "git commit -a")
changes on filesystem:
 vtkutils/vtkKWRGBATransferFunctionEditorTester-scalars.mgh | 2 +-

$> git diff
diff --git a/vtkutils/vtkKWRGBATransferFunctionEditorTester-scalars.mgh b/vtkutils/vtkKWRGBATransferFunctionEditorTester-scalars.mgh
index 9ea90d3..7bc0177 100644
--- a/vtkutils/vtkKWRGBATransferFunctionEditorTester-scalars.mgh
+++ b/vtkutils/vtkKWRGBATransferFunctionEditorTester-scalars.mgh
@@ -1 +1 @@
-/annex/objects/SHA256-s655672--85f9b50e8fb8a72a8783152c7ad098c0600222256a7244ccd595cbe67b9ea949
+/annex/objects/SHA256E-s655672--85f9b50e8fb8a72a8783152c7ad098c0600222256a7244ccd595cbe67b9ea949.mgh
changes on filesystem:
 vtkutils/vtkKWRGBATransferFunctionEditorTester-scalars.mgh | 2 +-

$> ls -ld vtkutils/vtkKWRGBATransferFunctionEditorTester-scalars.mgh
-rw------- 1 yoh yoh 655672 Jun  1 23:28 vtkutils/vtkKWRGBATransferFunctionEditorTester-scalars.mgh

$> git annex version
git-annex version: 6.20160523+gitg33c00ab-1~ndall+1

fixed --Joey