The issue is you are echoing raw post_content field from object. It isn’t what usually gets to front-end. Try:
apply_filters( 'the_content', $post->post_content )
If you want to run shortcodes alone (without bunch of other filters) you can do:
do_shortcode( $post->post_content )
Edit re-read your question… Is there a possibility that this thing gets recursive? Post containing slider shortocde that calls itself?
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