tl;dr: A bug in last-changed-revision was reported on users@, a regression
test and a fix have been committed, but we should audit nearby code for a
potential similar problem:
> http://svn.apache.org/r1813794 fixes the file content case. We should also audit the other callers of svn_fs_contents_different and svn_fs_props_different and see whether they should use svn_fs_contents_changed and svn_fs_props_changed (respectively), particularly the calls elsewhere in reporter.c.