I might be responsible for that optimization. I made some modifications to the regex engine a couple years ago involving skipping non-pattern parts of regexes when looking to optimize. So, how can can you defeat it? Well, you could wrap the 'XXX' inside a (??{ ... }).
$rx = qr/.../;
" failed " =~ /(?{ $ok = 1 })(??{ $rx })/;
print "OK = $ok\n";
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