encountering this as well. noticed my Option fields disappeared only when i added a custom post type to the general archive.
function archive_include_cpt( $query ) {
if( is_category() || is_tag() && empty( $query->query_vars['suppress_filters'] ) ) {
$query->set( 'post_type', array( 'project', 'post' ));
return $query;
}
}
add_filter( 'pre_get_posts', 'archive_include_cpt' );
(via)
maybe this is helpful? bummer this thread is marked as solved. perhaps i’ll start another?