GA4 Purchase Event Firing Twice

add_action( 'woocommerce_thankyou', 'propulse_ga4_purchase_once', 5, 1 );

function propulse_ga4_purchase_once( $order_id ) {
	if ( ! $order_id ) {
		return;
	}

	$order = wc_get_order( $order_id );
	if ( ! $order ) {
		return;
	}

	// Already pushed for this order — do nothing.
	if ( $order->get_meta( '_propulse_ga4_tracked' ) ) {
		return;
	}

	$items = array();
	foreach ( $order->get_items() as $item ) {
		$product = $item->get_product();
		$items[] = array(
			'item_id'   => $product ? $product->get_sku() : '',
			'item_name' => $item->get_name(),
			'price'     => (float) $order->get_item_total( $item, false, true ),
			'quantity'  => (int) $item->get_quantity(),
		);
	}

	$payload = array(
		'event'     => 'purchase',
		'ecommerce' => array(
			'transaction_id' => $order->get_order_number(),
			'value'          => (float) $order->get_total(),
			'tax'            => (float) $order->get_total_tax(),
			'shipping'       => (float) $order->get_shipping_total(),
			'currency'       => $order->get_currency(),
			'items'          => $items,
		),
	);

	echo '<script>window.dataLayer = window.dataLayer || [];';
	echo 'window.dataLayer.push(' . wp_json_encode( $payload ) . ');</script>';

	$order->update_meta_data( '_propulse_ga4_tracked', current_time( 'mysql' ) );
	$order->save();
}