The code was assuming that if an Endpoint got moved from one slice to
another, and one is "local" but the other isn't, then we should prefer
the local one. But this doesn't make sense; if it's actually the same
Endpoint (i.e., same targetRef) then both copies will have the same
Hostname. And if it's not the same Endpoint, then one of the two
Endpoints is wrong, but there's no reason to assume it's the non-local
one.
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