It’s good to hear you are looking into it!
It happened again on several of my sites as of yesterday’s update (version 5.0.9).
It seems Super Page Cache is the only plugin that has been updated, alongside the advanced-cache.php and wp-config.php files, which were updated at the same timestamp.
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This reply was modified 1 year, 6 months ago by ekmantime.
I’ve had the same problem.
The latest updates, including version 5.0.8 have left my wp-config.php broken.
Either by just leaving one row at the top like so:
<?php
define('WP_CACHE', true); // Added by WP Cloudflare Super Page Cache
or by leaving only the upper half of the file intact.
Super Page Cache is probably the culprit since it’s the only plugin recently updated when this error occurs. Shortly after the plugin update, my advanced-cache.php file is edited at the same timestamp as wp-config.php. And Super Page Cache is the only plugin editing the advanced-cache.php file.
Unfortunately, after multiple plugin updates, I’ve been able to confirm this error across over 50 sites, without fail.