https://woocommerce.wp-a2z.org/oik_api/wc_delete_product_transients/
You need to clear only 1 transient:
delete_transient( 'wc_var_prices_'. $product->get_id() );
https://woocommerce.wp-a2z.org/oik_api/wc_delete_product_transients/
You need to clear only 1 transient:
delete_transient( 'wc_var_prices_'. $product->get_id() );