File handle (given as suffix) ignored without warning

Filehandle ignored

say 'stdout:';
say(1);
say 2;
3.say;
say '';

say '"b" should not be here:';
my $out = open('test.txt', :w);
$out.say: 'a';
'b'.say(:$out);  # <======
$out.say('c');
close $out;

say '';
say 'lines in file:';
run('wc', '-l', 'test.txt');
say 'content of file:';
run('cat', 'test.txt');

print "\n";

#`{{
output of the above:

stdout:
1
2
3

"b" should not be here:
b

lines in file:
       2 test.txt
content of file:
a
c

}}