Hook woocommerce_view_order not working after update

Hi guys,

After the last WC update we noticed that our “Download invoice” and “Reorder” buttons are not displaying anymore on the “view-order” pages.

We use the same function for “woocommerce_thankyou_order_received_text” and it works, so our guess is that someone weird is going on with the “woocommerce_view_order” hook.

Here’s our function :

add_filter('woocommerce_view_order', 'wc_order_actions', 9, 2);
add_filter('woocommerce_thankyou_order_received_text', 'wc_order_actions', 9, 2);
function wc_order_actions( $output, $order ) {
	if ( is_user_logged_in() ) {
		$pdf_url = wp_nonce_url( admin_url( 'admin-ajax.php?action=generate_wpo_wcpdf&template_type=invoice&order_ids=' . $order->id  . '&my-account'), 'generate_wpo_wcpdf' );
    		$output = '<div class="order-actions"><a href="'.esc_attr($pdf_url).'" class="button">Download Invoice</a>';
		if(isset($_GET['view-order'])) {
				$order_id = $_GET['view-order'];
				//$order = new WC_Order($order_id);
				woocommerce_order_again_button( $order );
		}
		$output .= '</div>';
	}
	return $output;
}

System report :

### WordPress Environment ###

Home URL: https://www.patchify.com
Site URL: https://www.patchify.com
WC Version: 2.6.9
Log Directory Writable: ?
WP Version: 4.7
WP Multisite: –
WP Memory Limit: 512 MB
WP Debug Mode: ?
WP Cron: ?
Language: en_US

### Server Environment ###

Server Info: Apache
PHP Version: 7.0.8-0ubuntu0.16.04.3
PHP Post Max Size: 100 MB
PHP Time Limit: 3600
PHP Max Input Vars: 1000
cURL Version: 7.47.0
OpenSSL/1.0.2g

SUHOSIN Installed: –
MySQL Version: 5.7.14
Max Upload Size: 50 MB
Default Timezone is UTC: ?
fsockopen/cURL: ?
SoapClient: ?
DOMDocument: ?
GZip: ?
Multibyte String: ?
Remote Post: ?
Remote Get: ?

### Database ###

WC Database Version: 2.6.9
: 
woocommerce_sessions: ?
woocommerce_api_keys: ?
woocommerce_attribute_taxonomies: ?
woocommerce_downloadable_product_permissions: ?
woocommerce_order_items: ?
woocommerce_order_itemmeta: ?
woocommerce_tax_rates: ?
woocommerce_tax_rate_locations: ?
woocommerce_shipping_zones: ?
woocommerce_shipping_zone_locations: ?
woocommerce_shipping_zone_methods: ?
woocommerce_payment_tokens: ?
woocommerce_payment_tokenmeta: ?
MaxMind GeoIP Database: ?

### Active Plugins (33) ###

Query Monitor: by John Blackbourn – 2.13.2
Ultimate Addons for Visual Composer: by Brainstorm Force – 3.16.7
Affiliates Enterprise: by itthinx – 2.16.5
Affiliates Permanent: by itthinx – 1.3.0
Affiliates WooCommerce Integration: by itthinx – 1.6.0
Brozzme Multiple Admin Emails: by Benoti – 1.2.0
Cloudflare: by John Wineman
Furkan Yilmaz
Junade Ali (Cloudflare Team) – 3.1.1

Cornerstone: by Themeco – 1.3.3
Formidable AWeber: by Strategy11 – 2.01
Formidable: by Strategy11 – 2.02.11
Global Content Blocks: by Dave Liske – 2.1.5
Google Analytics by Yoast Premium: by Team Yoast – 5.4.7
Groups: by itthinx – 1.13.1
WPBakery Visual Composer: by Michael M - WPBakery.com – 5.0.1
Popup Maker: by WP Popup Maker – 1.4.21
WPML Multilingual CMS: by OnTheGoSystems – 3.6.2
UberMenu Conditionals: by Chris Mavricos
SevenSpark – 3.0

UberMenu 3 - The Ultimate WordPress Mega Menu: by Chris Mavricos
SevenSpark – 3.2.5

Aelia Currency Switcher for WooCommerce: by Aelia – 3.9.11.160928
WooCommerce Stripe Gateway: by Automattic – 3.0.6
WooCommerce Google Analytics Integration: by WooThemes – 1.4.0
Woocommerce Image Zoom: by wpbean – 1.0
WooCommerce Multilingual: by OnTheGoSystems – 4.0.1
WooCommerce Order Status Manager: by WooThemes / SkyVerge – 1.6.3
WooCommerce PDF Invoices & Packing Slips: by Ewout Fernhout – 1.5.38
woocommerce Price and size: by RWS – 1.0.0
WooCommerce TM Extra Product Options: by themecomplete – 4.4
WooCommerce WooCart Pro: by Festi Team – 2.4
WooCommerce: by WooThemes – 2.6.9
WP Mail Logging: by Christian Z?ller – 1.7.0
WPML Media: by OnTheGoSystems – 2.1.23
WPML String Translation: by OnTheGoSystems – 2.5.1
WPML Translation Management: by OnTheGoSystems – 2.2.6

### Settings ###

Force SSL: –
Currency: USD (US$)
Currency Position: left
Thousand Separator: ,
Decimal Separator: .
Number of Decimals: 16

### API ###

API Enabled: ?

### WC Pages ###

Shop Base: #4 - /marketplace/
Cart: #5 - /cart/
Checkout: #6 - /checkout/
My Account: ? Page does not contain the shortcode: [woocommerce_my_account]

### Taxonomies ###

Product Types: external (external)
grouped (grouped)
simple (simple)
variable (variable)

### Theme ###

Name: X - Child Theme: Integrity Light
Version: 1.0.0
Author URL: https://theme.co/
Child Theme: ?
Parent Theme Name: X
Parent Theme Version: 4.6.4
Parent Theme Author URL: https://theme.co/
WooCommerce Support: ?

### Templates ###

Overrides: Your theme has a woocommerce.php file
you will not be able to override the woocommerce/archive-product.php custom template since woocommerce.php has priority over archive-product.php. This is intended to prevent display issues.

Overrides: x/woocommerce/cart/cart-empty.php
x-child-integrity-light/woocommerce/cart/cart-totals.php
x/woocommerce/cart/cross-sells.php
x-child-integrity-light/woocommerce/checkout/form-checkout.php
x-child-integrity-light/woocommerce/checkout/review-order.php
x-child-integrity-light/woocommerce/emails/email-order-details.php
x/woocommerce/loop/loop-end.php
x/woocommerce/loop/loop-start.php
x/woocommerce/loop/pagination.php
x-child-integrity-light/woocommerce/myaccount/my-account.php
x/woocommerce/notices/error.php
x/woocommerce/notices/notice.php
x/woocommerce/notices/success.php
x-child-integrity-light/woocommerce/order/order-details-item.php
x-child-integrity-light/woocommerce/order/order-details.php
x-child-integrity-light/woocommerce/single-product/add-to-cart/variation.php
x/woocommerce/single-product/product-image.php
x/woocommerce/single-product/product-thumbnails.php
x/woocommerce/single-product/related.php
x/woocommerce/single-product/tabs/tabs.php
x/woocommerce/single-product/up-sells.php
x/woocommerce/single-product-reviews.php