svn diff on missing directory deletes?

I am having a problem diff'ing two tags that differ only in additions of
a new directory and files contained in a directory. Specifically,

In revision B, I added /trunk/directory and the file
/trunk/directory/file. Revision A is revision immediately prior to
revision B. I then make two tags, /tags/tagA and /tags/tagB which are
identical to A and B respectively. So...

svn diff --old svn://repos/tags/tagA --new svn://repos/tags/tagB

yields the correct result.

However,

svn diff --old svn://repos/tags/tagB --new svn://repos/tags/tagA

shows no diffs whatsoever (notice that the order of tagA and tagB is
swapped).

I checked the same procedure between two tags that differ only in the
addition of a new file in an existing directory (exists in both tags)
and svn diff works with either order.

Is this a bug or a feature?

-- 
Chris Wein
Software Manager
Mobilygen Corp.
E-Mail : cwein@mobilygen.com
Phone  : 408-869-4035
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