dump-load of a repository modifies verbose log output: M line lost

On a Debian/unstable machine with Subversion 1.9.2 and the MPFR
repository:

I currently have:

zira:~> TZ=UTC svn log -r 1984 -v file:///home/vinc17/private/svn-mpfr
------------------------------------------------------------------------
r1984 | vlefevre | 2002-07-23 16:22:08 +0000 (Tue, 23 Jul 2002) | 2 lines
Changed paths:
   M /trunk/mul.c

Fixed permissions.

------------------------------------------------------------------------

But after a dump-load:

zira:~> TZ=UTC svn log -r 1984 -v file:///home/vinc17/private/test-svn-mpfr
------------------------------------------------------------------------
r1984 | vlefevre | 2002-07-23 16:22:08 +0000 (Tue, 23 Jul 2002) | 2 lines

Fixed permissions.

------------------------------------------------------------------------

The "M /trunk/mul.c" line has been lost!

FYI, this came from the CVS conversion, where the permissions of mul.c
were changed, but with no effect in the SVN repository.

I don't know whether this is due to a buggy change in the format of
the dump, or a bug in the load. The dump of this revision changed in
the following way for this revision:

 Node-path: trunk/mul.c
 Node-kind: file
 Node-action: change
-Text-delta: true
-Text-delta-base-md5: a79ede6a595f7bad6a4549c23ef9cd2b
-Text-delta-base-sha1: a9ce78ba643c727019f926d957f37414cfc1a050
-Text-content-length: 15
-Text-content-md5: a79ede6a595f7bad6a4549c23ef9cd2b
-Text-content-sha1: a9ce78ba643c727019f926d957f37414cfc1a050
-Content-length: 15

-[Contents]

This might be related to:

  http://subversion.tigris.org/issues/show_bug.cgi?id=4598

-- 
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)