If I have a TopicOne that contains simply
Redirect: TopicTwo
Summary: Old summary for TopicOne
and TopicTwo has this content
Summary: Summary for TopicTwo
the hovertext for TopicOne should show "Summary for
TopicTwo", but instead shows "Old summary for TopicOne."
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I think this is a feature, not a bug.
It is useful to be able to set up a topic that redirects to an
external link (not a wiki page). The hovertext for the topic is
determined by the topic page. The external link by its nature
doesn't have a summary (or any other properties).
I think it is reasonable that Redirect: should do just that--
generate a redirect, without attempting any other behavior
changes. You can always change the summary on the
redirect page to get the effect that you want.