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No, that bug is totally different. I'm using the regular
BSDDB backend.  Please see the URL I posted in my last
comment, it shows the behavior.

The problem isn't in what's being displayed in the drop down
listboxes, it's after I select "topic" in group-on and
redisplay, the actual list of issues is displaying multiple
"documentation" sections. the issues in them are distinct,
i.e., it's not displaying the same issue multiple times,
it's just unnecessarily splitting up a single group into
multiple groups.