I have the same issue, the acf get_field() function in footer returned null. Native WP function get_post_meta( get_the_ID(), ‘option_key’, true ) didn’t work to. But when I’ve noticed that get_the_ID() function in footer returned the wrong value because I forgot to reset query after custom WP_Query. So, reset custom WP_Query (wp_reset_query()) or hard code the page ID.
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