(datalad-0.13) nastase@head2:/backup/tmp/sam-study-1021/containers/licenses$ git annex metadata freesurfer -s distribution-restrictions=sensitive
metadata freesurfer 
  distribution-restrictions=sensitive
  distribution-restrictions-lastchanged=2020-06-26@14-15-10
  lastchanged=2020-06-26@14-15-10
ok
(recording state in git...)
error: invalid object 100644 13a548163abc38cac81810399bcf5a8792c56763 for 'group.log'
fatal: git-write-tree: error building trees
git-annex: failed to read sha from git write-tree
CallStack (from HasCallStack):
  error, called at ./Git/Sha.hs:23:15 in main:Git.Sha

(datalad-0.13) nastase@head2:/backup/tmp/sam-study-1021/containers/licenses$ git annex version | head -n 1
git-annex version: 8.20200617-g02765b8

I think nothing odd was done besides trying to make this file saved unlocked for a while with datalad