Prevent date_modified changes when reducing stock - php

Question

I have written a script that, among other things, shows me how many days ago a product was updated/modified. Everything works perfectly, however it has become evident to me that get_date_modified() is returning the date/time of the last time the product was ordered.
I have a custom script that is reducing stock based on an attribute. I believe this is the culprit. I would like date_modified not to update on stock change via purchase, only when the product is manually updated.
How can I bypass the updating of date_modified when this function fires? Is there a filter that can be utilized perhaps?
Stock reduction code:
// ---------------------------------------------------------------------------------------- //
// -------------------------- REDUCE WEIGHT BASED ON WEIGHT FIELD ----------------------- //
// ---------------------------------------------------------------------------------------- //
// reduce stock based on 'pa_weight' attribute
add_filter( 'woocommerce_order_item_quantity', 'filter_order_item_quantity', 10, 3 );
function filter_order_item_quantity( $quantity, $order, $item )
{
$product = $item->get_product();
$term_name = $product->get_attribute('pa_weight');
// 'pa_weight' - keep only the numbers
$quantity = preg_replace('/[^0-9.]+/', '', $term_name);
// new quantity
if( is_numeric ( $quantity ) && $quantity != 0 )
$quantity *= $quantity;
return $quantity;
}
/**
* Order change stock reduction fix.
*
* #param $prevent
* #param $item
* #param $item_quantity
* #return bool|mixed
*/
function custom_stock_reduction_order_change( $prevent, $item, $item_quantity ) {
$stock_reduced = wc_stock_amount( $item->get_meta( '_reduced_stock', true ) );
$stock_reduction = filter_order_item_quantity( $item->get_quantity(), null, $item );
if ( $stock_reduction == $stock_reduced ) {
$prevent = true;
}
return $prevent;
}
add_filter( 'woocommerce_prevent_adjust_line_item_product_stock', 'custom_stock_reduction_order_change', 10, 3 );