ignore_sticky_posts will still return a sticky post, it just won’t move it to the top of the list.
Exclude sticky posts from a category. Return ALL posts within the category, but don’t show sticky posts at the top. The ‘sticky posts’ will still show in their natural position (e.g. by date):
$query = new WP_Query( 'ignore_sticky_posts=1&posts_per_page=3&cat=6' );
https://codex.ww.wp.xz.cn/Sticky_Posts
