reproduced this now

diff --git a/doc/bugs/reports_file___34__modified__34___whenever_it_is_not/comment_8_927028d040b0e24d772b667324b1a5e1._comment b/doc/bugs/reports_file___34__modified__34___whenever_it_is_not/comment_8_927028d040b0e24d772b667324b1a5e1._comment
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--- /dev/null
+++ b/doc/bugs/reports_file___34__modified__34___whenever_it_is_not/comment_8_927028d040b0e24d772b667324b1a5e1._comment
@@ -0,0 +1,9 @@
+[[!comment format=mdwn
+ username="joey"
+ subject="""comment 8"""
+ date="2022-09-22T17:02:04Z"
+ content="""
+I've fixed the issue I found with --timestamp combined with -J. Which I do
+think could have resulted in the same kind of problem. But you've shown
+that is not the cause in your case..
+"""]]

diff --git a/doc/bugs/reports_file___34__modified__34___whenever_it_is_not/comment_9_64ba2901154b629a9697b427f3ad92e2._comment b/doc/bugs/reports_file___34__modified__34___whenever_it_is_not/comment_9_64ba2901154b629a9697b427f3ad92e2._comment
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--- /dev/null
+++ b/doc/bugs/reports_file___34__modified__34___whenever_it_is_not/comment_9_64ba2901154b629a9697b427f3ad92e2._comment
@@ -0,0 +1,21 @@
+[[!comment format=mdwn
+ username="joey"
+ subject="""comment 9"""
+ date="2022-09-22T17:04:35Z"
+ content="""
+Thanks for the --debug. It shows that git-annex is asking git to refresh the index,
+although from this we can't see for sure if it fed the name of the file in on stdin or not:
+
+       [2022-09-21 21:30:03.77319] (Utility.Process) process [3968453] feed: git [\"--git-dir=.git\",\"--work-tree=.\",\"--literal-pathspecs\",\"-c\",\"annex.debug=true\",\"update-index\",\"-z\",\"--index-info\"]
+
+The other thing that seems maybe relevant is that the transfer happens in a `git-annex transferrer` process.
+So, I think you have annex.stalldetection set.
+
+       [2022-09-21 21:29:59.931525] (Utility.Process) process [3968203] chat: /home/dandi/miniconda3/envs/dandisets/bin/git-annex [\"transferrer\",\"-c\",\"annex.debug=true\"]
+
+And interestingly, that transferrer process fails at the end:
+
+       [2022-09-21 21:30:06.373343] (Utility.Process) process [3968203] done ExitFailure 1
+
+Aha! I can reproduce it by setting annex.stalldetection.
+"""]]