SOLVED:
I had this in the function to save the meta data (like an idiot!!)
if ( !$value ) delete_post_meta( $post->ID, $key ); // Delete if blank
So it wasn’t saving the meta value if set to 0.
I changed it to:
if ( !$value ) add_post_meta( $post->ID, $key, '0' ); // add 0 if blank
Simple to solve… after hours of agony.
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