custom field slug not working

I’m using the plugin “List Category Posts” to display posts from a category in an un-ordered list using a shortcode.
( https://wordpress.org/plugins/list-category-posts/ )

In the other notes ( https://wordpress.org/plugins/list-category-posts/other_notes/ ) of the plugin there are instructions on how to also include custom fields by using their slugs with the shortcode parameter “customfield_display”.

When i try to include some of my custom fields created with WCK by their slug, such as “customfield_display=bedrooms,bathrooms,price” nothing works… but if I put in the slug of the meta box that those custom fields are under – that works…. but I don’t want to display the whole meta box, I just want to show some of my custom fields and I cannot….

So, how can I get around this? Am I goint to have to stop using WCK for my custom fields?

https://wordpress.org/plugins/wck-custom-fields-and-custom-post-types-creator/