Ikraav, we’re still having the same issue, even after commenting the line
wp_cache_add_non_persistent_groups('acf'); inside the plugin ‘cache.php’ file.
But, after some more investigation it seems like this is happening due to the object cache being full. Since the object cache is full ACF cannot write data to it and ends up retrieving all content from the DB directly.
You might be having the same issue.
