404 for custom post types

Hey guys,

I have a wordpress network with 9 websites, all with the same configuration and same custom post types.

Every website has more custom post types but only 2 gave me the 404 error: restaurant and camera(room).

This is the 2 custom post types declaration:

$labels = array(
    'name' => _x('Restaurante', 'restaurant'),
    'singular_name' => _x('Restaurant', 'restaurant'),
    'add_new' => _x('Adauga Restaurant', 'restaurant'),
    'add_new_item' => __('Adauga Restaurant'),
    'edit_item' => __('Editeaza Restaurant'),
    'new_item' => __('Restaurant Nou'),
    'view_item' => __('Vizualizeaza Restaurant'),
    'search_items' => __('Cauta Restaurant'),
    'not_found' =>  __('Nu s-a gasit niciun Restaurant'),
    'not_found_in_trash' => __('Niciun Restaurant in Trash'),
    'parent_item_colon' => ''
  );
register_post_type('restaurant', array(
	'label' => __('Restaurante'),
	'labels' => $labels,
	'singular_label' => __('Restaurant'),
	'public' => true,
	'show_ui' => true,
	'capability_type' => 'post',
	'add_new' => _x('Restaurant Nou', 'restaurant'),
	'add_new_item' => __('Restaurant Nou'),
	'rewrite' => array( 'slug' => 'restaurant-hotel', 'with_front' => false ),
	'query_var' =>false,
	'menu_position' => 7,
	'hierarchical' => true,
	'supports' => array('title', 'editor', 'thumbnail', 'page-attributes')
));

$labels = array(
    'name' => _x('Camere', 'camera'),
    'singular_name' => _x('Camera', 'camera'),
    'add_new' => _x('Adauga Camera', 'camera'),
    'add_new_item' => __('Adauga Camera'),
    'edit_item' => __('Editeaza Camera'),
    'new_item' => __('Camera Noua'),
    'view_item' => __('Vizualizeaza Camera'),
    'search_items' => __('Cauta Camera'),
    'not_found' =>  __('Nu s-a gasit nicio Camera'),
    'not_found_in_trash' => __('Nicio Camera in Trash'),
    'parent_item_colon' => ''
  );
register_post_type('camera', array(
	'label' => __('Camere'),
	'labels' => $labels,
	'singular_label' => __('Camera'),
	'public' => true,
	'show_ui' => true,
	'capability_type' => 'post',
	'add_new' => _x('Camera Noua', 'camera'),
	'add_new_item' => __('Camera Noua'),
	'hierarchical' => false,
	'rewrite' => array( 'slug' => 'room', 'with_front' => false ),
	'query_var' => false,
	'menu_position' => 7,
	'register_meta_box_cb' => 'ch_camera_metaboxes',
	'supports' => array('title', 'editor', 'thumbnail')
));

If i reset the permalinks structure all this works, but only for a while.
I deactivated all the plugin, same story.
Also, i have no page with the custom post type slug as a name.

What i don’t understand is why this happens only for this 2, and not for all custom post types active on the website and what trigger this error.

This is how WP_Query and WP_rewrite looks like when the 404 error is triggered. Note that wordpress searches for an attachment instead of that specific custom post type:

When “camera” post type fails – https://pastebin.com/nZzsxK4V (WP_Query) and https://pastebin.com/3bDp2aF4 (WP_Rewrite)

When “restaurant” post type fails – https://pastebin.com/3wnzP8uL

The url for this website is https://continentalhotels.ro/Grand-Hotel-Continental-Bucuresti/ and the links for 404 are: https://continentalhotels.ro/Grand-Hotel-Continental-Bucuresti/room/camera-superior/ for “camera” custom post type and https://continentalhotels.ro/Grand-Hotel-Continental-Bucuresti/restaurant-hotel/concerto/ for “restaurant” custom post type.

Note that in the moment you access the url they could work since i’ve added a cron for flushing the rewrite rules hourly until i fix this.

Any help is highly appreciated!
Thanks.