I had recently answered a post, Re: An Insane Typo Bug, and it relates to your question in an interesting way. The original post in that thread has a totally different face with your wonder, but both are about the same fact that, in scalar context, m// returns either 1 or 0.
For pos(), try this, it gives you 1 and 9, so pos() does work:
use strict;
use warnings;
$_ = "0123456789";
my $ret = m/0/g;
print "ret = $ret, pos = " . pos() . "\n";
$ret = m/8/g;
print "ret = $ret, pos = " . pos() . "\n";
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