Custom post type: No posts found even if counter has a count

Question

I have a weird bug where I created a custom post type, started to create posts in it and when I went back on the WP-Admin page listing all of the posts of that custom post type, no posts are found. Even if the counter over the list lists 7 found posts.

I've got another custom post type in my site, with the exact same setup (except names), that works normally too.

Anybody encountered that bug before?

EDIT: I've found what was bugging, but now dont know how to fix it. Yes, in use a pre_get_posts to change an unrelated query, but it only acts on the post type pix_events and so it screws up every custom post type except events.

I guess i'm missing a return for default, but can't find what I am supposed to return in that case.

function pix_change_query( $query ) {
    if ( is_archive('pix_events') ) {
        $query->set( 'orderby', 'meta_value_num' );
        $query->set( 'meta_key', 'date_work' );
        $query->set( 'meta_type', 'DATE' );
        $query->set( 'order', 'ASC' );
        $query->set( 'meta_query', array(
            array(
                'key'=>'date_work',
                'compare'=>'>=',
                'value'=>date('Ymd'),
                'type'=>'DATETIME',
            )
        ) );
    }

}
add_filter( 'pre_get_posts', 'pix_change_query' );

Answer 1

My pre get posts functions went sideways. My condition was applying for all archives, not just the events one. Here is the code that is right. Notice the is_post_type_archive.

function pix_change_query( $query ) {
   if ( is_post_type_archive('pix_events') && $query->is_main_query() ) {
       $query->set( 'orderby', 'meta_value_num' );
       $query->set( 'meta_key', 'date_work' );
       $query->set( 'meta_type', 'DATE' );
       $query->set( 'order', 'ASC' );
       $query->set( 'meta_query', array(
           array(
               'key'=>'date_work',
               'compare'=>'>=',
               'value'=>date('Ymd'),
               'type'=>'DATETIME',
           )
       ) );
       return;
   }
}