[exim] Isn't save, in a user filter, a significant action?

Consider the following user filter:

    $ cat .forward
    # exim filter

    if $h_subject: is "exim filter bug"
    then
      testprint "$h_subject printed by is operator"
      save bug
    endif
    deliver jc@???
    $ 

My understanding of the documentation is that a message, with a subject of
"exim filter bug", would not be sent to jc@???. In practice, I had to
add to the save command the seen modifier.
Did I misunderstand the documentation?


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