WordPress at a glance
filter is not described

woocommerce_admin_order_item_thumbnail filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_admin_order_item_thumbnail', 'filter_function_name_884', 10, 3 );
function filter_function_name_884( $product_image, $item_id, $item ){
	// filter...

	return $product_image;
}
$product_image
-
$item_id
-
$item
-

Where the hook is called

In file: /includes/admin/meta-boxes/views/html-order-item.php
woocommerce_admin_order_item_thumbnail
woocommerce/includes/admin/meta-boxes/views/html-order-item.php 14
$thumbnail    = $product ? apply_filters( 'woocommerce_admin_order_item_thumbnail', $product->get_image( 'thumbnail', array( 'title' => '' ), false ), $item_id, $item ) : '';

Where in WP core the hook is used WooCommerce

Usage not found.