matmarex added a comment.
It could potentially be a WMF severs' misconfiguration, too.
The log you pasted above seems to have it handled correctly:
Content-disposition: form-data; name="chunk";
filename="FAKE-NAME"\nContent-Transfer-Encoding: binary\n\n\r\n
Note the '\r'.
TASK DETAIL
https://phabricator.wikimedia.org/T132676
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To: matmarex
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