WooCommerce - "Edit Order" Functionality - php

Question

Thank you for your time!
The below code does the following:
If a customer want to edit there order:
A credit for the full amount previously paid is applied
Customer can add/subtract items from there cart
System calculates the new subtotal
System calculates cart items tax
Subtracts the new total from the customer credit to get the final new total
The issue:
When the system is calculating the Tax it add the Subtotal + Credit * Tax Rate.
For Example:
Order Details:
Subtotal $100.00
Tax $4.48 (Subtotal - Credit * 8.8750%)
Credit -$49.61
Total $54.87
When its supposed to be:
Order Details:
Subtotal $100.00
Tax $8.88 (Subtotal * 8.8750%)
Credit -$49.61
Total $59.27
I tried adding a third argument:
$cart->add_fee( 'Credit', $credit, false);
Screenshot:
The code:
add_action( 'woocommerce_cart_calculate_fees', 'bbloomer_use_edit_order_total', 20, 1 );
function bbloomer_use_edit_order_total( $cart ) {
if ( is_admin() && ! defined( 'DOING_AJAX' ) ) return;
$edited = WC()->session->get('edit_order');
if ( ! empty( $edited ) ) {
$order = new WC_Order( $edited );
$credit = -1 * $order->get_total();
$cart->add_fee( 'Credit', $credit);
}
}