Multisite delete cache problem

Hi.

I have a cronjob which runs every 10 minutes.
We have a WordPress multisite installation with 2 sites (on separate domains) in the multisite network.
We are creating/updating/deleting WP Job Manager posts with this php cron script.
And everything is cached with WP Fastest Cache.

So here is my problem:
I am calling the cronjob on Site1 (example.hu/do-cron.php), and this script manipulates data on both multisite websites.
I am switching between WP multisite with the standard switch_to_blog() function provided by WP.

When everything is done, I want to delete the WPFC cache for both sites. I use the following functions to do so:
wpfc_clear_all_cache();
wpfc_clear_all_cache(true);

However if you look inside the getWpContentDir() WPFC function’s code (which is used by the previously mentioned function), you can see it determines the current website’s domain name from $_SERVER[‘HTTP_HOST’] – instead of using the standard get_site_url() WordPress function.
The difference here is that standard WP function handles multisite’s switch_to_blog() functions, while the $_SERVER variable obviously doesn’t.

In this case because I called the cronjob from Site1, it only deletes cache for Site1, even if I switch to Site2 via the switch_to_blog() function because it gets the site url from the server variable.

Edit: this feature is implemented for WPML in the getWpContentDir() function. The same would be the intended behavior for multisite websites.

Could you please fix this issue?

Thanks a lot,
Balazs