Advanced search for meta fields

The meta_query parameter must be an array of array if you want to add relation between different key, even they only one key to grab.

So $query->set( ‘meta_query’, $meta_query );

Must be

$query->set( 'meta_query', array($meta_query) );

You can have a look to WP_Query for more details.

Hope it helps and work, I just look for this details 😉

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