Wp Meta Query does not work while simple Query Works - php

Question

I have created a Custom Post Type and added 50+ posts.
Now this post type have some meta values which I need to display.
Here is how I created the post type:
function colorshadescpt() {
register_post_type( 'colorshades',
array(
'labels' => array(
'name' => __('Color Shades'),
'singular_name' => __('Shade'),
'add_new_item' => __('Add New'),
'edit_item' => __('Edit'),
'new_item' => __('Add New'),
'view_item' => __('View'),
),
'public' => true,
'supports' => array( 'title'),
'capability_type' => 'post'
)
);
}
add_action('init', 'colorshadescpt');
And added this meta_boxes:
$prefix = 'cg_';
$meta_boxes = array();
$meta_boxes[] = array(
'id' => 'colorcodes',
'title' => 'Color Code',
'pages' => array('colorshades'),
'fields' => array(
array(
'name' => 'Color code', // field name
'desc' => 'Enter Color code here.', // field description, optional
'id' => 'color_code', // field id, i.e. the meta key
'type' => 'text', // text box
'std' => '', // default value, optional
),
)
);
$meta_boxes[] = array(
'id' => 'colorshades',
'title' => 'Color Value',
'pages' => array('colorshades'),
'fields' => array(
array(
'name' => 'R', // field name
'desc' => 'Enter Red color value here.', // field description, optional
'id' => 'red_code', // field id, i.e. the meta key
'type' => 'text', // text box
'std' => '', // default value, optional
),
array(
'name' => 'G', // field name
'desc' => 'Enter green color value here.', // field description, optional
'id' => 'green_code', // field id, i.e. the meta key
'type' => 'text', // text box
'std' => '', // default value, optional
),
array(
'name' => 'B', // field name
'desc' => 'Enter blue color value here.', // field description, optional
'id' => 'blue_code', // field id, i.e. the meta key
'type' => 'text', // text box
'std' => '', // default value, optional
),
array(
'name' => 'Type', // field name
'desc' => 'Please Select type for shade.', // field description, optional
'id' => 'shade_color_type', // field id, i.e. the meta key
'type' => 'radio', // text box
'std' => 'product',
'options' => array( // array of key => value pairs for radio options
'product' => 'Product',
'machine' => 'Machine',
), // default value, optional
),
)
);
$meta_boxes[] = array(
'id' => 'productid',
'title' => 'Product Settings',
'pages' => array('colorshades'),
'fields' => array(
array(
'name' => 'Product Id',
'desc' => 'Enter the product id here.',
'id' => 'colors_product_id',
'type' => 'text',
'std' => '',
),
)
);
$meta_boxes[] = array(
'id' => 'shade_details',
'title' => 'Other Details',
'pages' => array('colorshades'),
'fields' => array(
array(
'name' => 'Details', // field name
'desc' => 'Enter shade details.', // field description, optional
'id' => 'colors_details', // field id, i.e. the meta key
'type' => 'textarea', // text box
'std' => '', // default value, optional
),
)
);
foreach ($meta_boxes as $meta_box) {
$my_box = new RW_Meta_Box_Taxonomy($meta_box);
}
Here is the screenshot of how it looks as a post:
How I am getting the result on the other side:
<?php
global $product;
$args = array(
'post_type' => 'colorshades',
'fields' => 'ids',
'posts_per_page' => -1,
'meta_query' => array(
array(
'key' => 'colors_product_id',
'value' => $product->id,
'compare' => '=',
)
)
);
$query = new WP_Query( $args );
if ($query->have_posts()):
foreach( $query->posts as $id ):
$Color_Code = get_post_meta($id, "color_code", true);
$R = get_post_meta($id, "red_code", true);
$G = get_post_meta($id, "green_code", true);
$B = get_post_meta($id, "blue_code", true);
$all_color_product_notification = '';
$image_url = site_url().'/wp-content/themes/porto/images/swatch.png';
echo '<div class="colors_box mb-4 mx-lg-4 mx-md-3 mx-2">
<p> '.get_the_title( $id ).'</p>
</div>';
?>
<?php
endforeach;
endif;
As you can see I am getting the post based on the meta field "product id", but Meta Query returns empty.
Without the meta query I get all the posts but I want on basis of Ids.
Here is the result if I query without Meta values:
Please guide me if I am doing something wrong here.