Exclude Post not working correctly

Hello,

The code below is not excluding the current post using ‘this’
<?php echo do_shortcode("[catlist id=17 numberposts=3 excludeposts=this]"); ?>

But if i designate the post ID to the exclude it does like below:
<?php echo do_shortcode("[catlist id=17 numberposts=3 excludeposts=37903]"); ?>

Any reason why ‘this’ is not removing the current post?

https://wordpress.org/plugins/list-category-posts/