Harm10

@tograczyk I submitted the question on that url.

@grola Thanks for your reply. I think I mentioned this earlier. The problem occurs on my test multi site which is not openly available. And then also solely when using browser Firefox. Browsers Edge and Chrome do not have this problem. I am willing to define some user access to you but then I have the problem on how to tell you this. Obviously I do not want to publish this here.

On a side note: I never work with blocks and also have no special plug-ins for that active. As reported when using Check Conflicts and switching everything off besides WooCommerce and Cart Weight the problem persisted. Even when I selected WP theme 2025. Could it maybe be something on the server side?

@stefancotitosu Thank your for your code. But I want to know when the maintenance page is displayed to a visitor. That is different from knowing the plugin is active. Is this possible to deduce from the global $wp_query and/or $GLOBALS[‘pagenow’]?

So what is [‘woo-cart-weight’] part pointing to then? Those brackets look like a shortcode to me?

There are no additional messages to be seen besides the warnings for other plugins that textdomain is loaded too early.

As I do not want to open up a site to the open net I am hesitant on giving you access.
I still have no clue why this only happens with this software set-up in browser Firefox. Edge and Chrome are no problem.
And how can that break your shortcode?
Speaking of that I tried to search your code for add_shortcode but did not find anything. Is this shortcode generated in a special way? And where is this located? Maybe I can try to do some debugging there myself?

@grola I have set-up a new sub site with the bare necessities (see part of WC log below). The problem occurred again. Then I changed the language to english to see the problem persist.
Before I tried a single site I tested the same thing in browser Chrome. The problem does not occur there!
My main browser is Firefox (134.0 64 bits).
So it has something to do with the type of browser? Any idea?
(As said earlier the live site with older versions of WP and WC is a single site but I tested that in Firefox too)

WC Version: 9.5.2
Legacy REST API Package Version: The Legacy REST API plugin is not installed on this site.
Action Scheduler Version: ✔ 3.8.2
Log Directory Writable: ✔
WP Version: 6.7.1
WP Multisite: ✔
WP Memory Limit: 256 MB
WP Debug Mode: ✔
WP Cron: ✔
Language: en_GB
External object cache: –

Active Plugins (16)

Advanced Custom Fields: by WP Engine – 6.3.11
Classic Editor: by WordPress Contributors – 1.6.7
Classic Widgets: by WordPress Contributors – 0.3
Contact Form 7: by Takayuki Miyoshi – 6.0.2
Core Rollback: by Andy Fragen – 1.3.7
Error Log Viewer by BestWebSoft: by BestWebSoft – 1.1.5
NS Cloner – Site Copier: by Never Settle – 4.4.7.5
Really Simple Security: by Really Simple Security – 9.1.4
Reveal IDs: by Oliver Schlöbe – 1.6.1
Server IP & Memory Usage Display: by Apasionados
Apasionados del Marketing – 2.1.0

User Login History: by Er Faiyaz Alam – 2.1.6
Cart Weight: by Octolize – 1.9.1
WooCommerce: by Automattic – 9.5.2
WP Crontrol: by John Blackbourn – 1.17.1
LightStart – Maintenance Mode, Coming Soon and Landing Page Builder: by Themeisle – 2.6.16
WP Rollback: by WP Rollback – 2.0.7

@emma24 I understand this is not main priority but I really want to advocate you to hook into the is_login() function of WP and deliver a value of true when the LP login screen is displayed!

For those who want to know the old method before is_login() was introduced: just check the value in $GLOBALS[‘pagenow’]. If it is wp-login.php then you can consider that the login screen is displayed.