WP_List_Table Not showing any entries - php

Question

Missing WP_List_Table Entries Screenshot Here
I'm trying to populate a list table in WordPress using WP_List_Table with country and state codes from WooCommerce, but it seems that either :display(), :prepare-items() or :column_default is failing me. Been staring myself blind for hours and I can't track down what's happening.
The class setup looks as follows:
<?php
if ( ! class_exists( 'WP_List_Table' ) ) {
require_once ABSPATH . 'wp-admin/includes/screen.php';
require_once ABSPATH . 'wp-admin/includes/class-wp-list-table.php';
}
class My_List_Table extends WP_List_Table {
public function __construct() {
parent::__construct(
array(
'singular' => __( 'state', 'my-text-domain' ),
'plural' => __( 'states', 'my-text-domain' ),
'ajax' => false,
)
);
}
public function get_columns() {
$columns = array(
'cb' => '<input type="checkbox" />',
'col_state_name' => __( 'Region Name', 'my-text-domain' ),
'col_state_id' => __( 'Region Code', 'my-text-domain' ),
);
return $columns;
}
public function column_default( $item, $column_name ) {
switch ( $column_name ) {
case 'col_state_id':
case 'col_state_name':
return $item[ $column_name ];
default:
return $item;
}
}
public function my_load_states() {
if ( get_option( 'my_countries' ) && get_option( 'my_current_country' ) && get_option( 'my_states_' . get_option( 'my_current_country' ) ) ) {
$states = get_option( 'my_states_' . get_option( 'my_current_country' ) );
update_option( 'myplugin', true );
return $states;
} else {
$states = WC()->countries->get_states( get_option( 'my_current_country' ) );
if ( is_array( $states ) ) {
return $states;
} else {
update_option( 'myplugin', true );
return '';
}
}
}
public function get_states() {
$data = array();
if ( get_option( 'my_states_' . get_option( 'my_current_country' ) ) && ! empty( get_option( 'my_states_' . get_option( 'my_current_country' ) ) ) && get_option( 'my_country' ) && in_array( get_option( 'my_current_country' ), get_option( 'my_countries' ), true ) ) {
$states = get_option( 'my_states_' . get_option( 'my_current_country' ) );
update_option( 'myplugin', true );
} else {
$states = $this->my_load_states();
}
if ( ! empty( $states ) ) {
foreach ( $states as $code => $name ) {
$temp = array(
'col_state_name' => $name,
'col_state_id' => $code,
);
array_push( $data, $temp );
}
return $data;
} else {
return '';
}
}
public function prepare_items() {
$this->_column_headers = $this->get_column_info();
$this->process_bulk_action();
$data = $this->get_states();
if ( ! empty( $data ) && is_array( $data ) ) {
usort( $data, array( &$this, 'usort_reorder' ) );
$per_page = count( $data );
$total_items = count( $data );
}
$current_page = $this->get_pagenum();
if ( is_array( $data ) && count( $data ) > 1 ) {
$found_data = array_slice( $data, ( ( $current_page - 1 ) * $per_page ), $per_page );
} else {
$found_data = $data;
$total_items = 0;
}
$this->set_pagination_args(
array(
'total_items' => $total_items,
'per_page' => $per_page,
)
);
$this->items = $found_data;
}
public function no_items() {
esc_html_e( 'No states avaliable.', 'my-text-domain' );
}
}
I'm initiating things through this:
<?php
class My_Admin {
...
public function my_add_menu_item() {
add_submenu_page(
'woocommerce',
'Locations',
'Locations',
'manage_options',
'my_states',
array( $this, 'my_settings_page' ),
);
}
public function my_settings_page() {
$slp_obj = new My_List_Table();
$slp_obj->prepare_items();
$slp_obj->display();
}
}
?>