log -g shows only one log-subtree in case of multiple, independent merges

When committing one revision with two different, independent merges, log
-g shows only one of these subtrees, however I would expect to see both
of them. Example (for I can supply corresponding test repository):

/trunk/dir1/file1 merged from /branches/b1
  (svn:mergeinfo : /branches/b15/dir1:17-20)

/trunk/dir2/file2 merged from /branches/b2
  (svn:mergeinfo : /branches/b18/dir2:20)

After committing /trunk to r21, svn log -g /trunk shows only

r21 (merge)
r20 (Result of merge from: r21)
r17 (some other changes)
...

However, svn log -g /trunk/dir1 shows (as expected):
r21 (merge)
r18 (Result of merge from: r21)
r17 (some other changes)
...

and svn log -g /trunk/dir2 shows (as expected):
r21 (merge)
r20 (Result of merge from: r21)
r14 (some other changes)
...

Shouldn't r18 also be displayed for svn log -g /trunk?

--
Best regards,
Marc Strapetz
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