MAIN subs in modules in Perl 6

example.txt

$ cat Foo.pm
module Foo;

sub MAIN() {
    say "OH HAI";
}

$ perl6 Foo.pm
$ # no output

According to S06:3364:

    At the end of
    the mainline code, however, a C<MAIN> subroutine will be called with
    whatever command-line arguments remain in C<@*ARGS>.  This call is
    performed if and only if:
    
    =over
    
    =item a)
    
    the compilation unit was directly invoked rather than
    by being required by another compilation unit, and
    
    =item b)
    
    the compilation unit declares a C<Routine> named "C<MAIN>", and
    
    =item c)
    
    the mainline code is not terminated prematurely, such as with an explicit call
    to C<exit>, or an uncaught exception.
    
    =back

I contend that the above example does a), b), and c). Is it a bug that it doesn't invoke MAIN?