Latest version 1.5.4 causes add_rewrite_rule stop working

Hi

Had an odd error where my cystom rewrite rules on prod suddenly stopped working. At the same time, the exact code worked in my dev env.

After hours of searching the web, asking on forums etc. I found the issue is caused by the Facebook plugin, which makes sense since it stopped working after the last update. What happends is if I add my custom rule to pass a queystring:
/activation/ac257990844463e28702befcf80ff89f/

I’m getting redirected to the startpage/index.php and nothing happens.

As of now my custom rules (set by the theme) are working as long as the Facebook plugin is disabled. If I enable it, my rules aren’t working, so I’m 100% sure the error is located somewhere in the plugin files.

I’m using the share/like button as shortcode, only on the start page:
<?php echo do_shortcode('[facebook_like_button href="' . site_url() . '" share="true"]');?>

Hopefully someone will find a solution to this, meanwhile I cannot use your plugin.

Thanks.

https://wordpress.org/plugins/facebook/