Custom Post Type Taxonomy – Permalinks generating, but posts not found

Your previous edit was a bit closer. Change the post type rewrite slug to:

cosmetics/treatments/%treatment-type%

Then change all instances of %type% to %treatment-type% in the treatment_permalink function.

Everything should then work correctly after you flush rewrites.

For future reference, the Monkeyman rewrite analyzer plugin is very helpful for debugging rewrite rules. As I mentioned, you can also dump the contents of $wp_query to see what WordPress is trying to query for in each request. You can put something like this directly in a 404 template for quick debugging of requests that you think should not be a 404:

<pre>
<?php print_r( $wp_query ); ?>
</pre>

You’ll see a list of all query vars with their values and the resultant SQL query WordPress is sending to the database.

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