I can't reproduce on my testblog, which makes things slightly more complicated.
Can you open up /wp-content/plugins/autoptimize/autoptimize.php and on line 50 replace
// if (!is_user_logged_in()) {
with
if (!is_feed()) {
and on line 93 replace
// }
with
}
This should stop any interference of Autoptimize with your feed?