[plt-scheme] Surprising behavior from "run-server"

This is r7563 of the PLT trunk.

Run the file "test.ss"; you'll see

    Sent hang; got #<eof>
    Sent list-tables; got #<eof>

That first line makes sense: the server to which we sent the 'hang
command has been killed because it ran too long.  But the other server
should have kept running, as far as I can tell.

Is this a bug, or am I failing to understand something about how
run-server works?

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