What is $post->pre_post_content exactly?
There’s no such thing. pre_post_content
is a filter that allows you to filter the result of sanitize_post_field() for the post_content
field of posts. But the standard WP_Post
class, which $post
usually is, does not have a pre_post_content
field.
If $post
on your site has such a field, then it’s likely being added by a plugin, but a web search of $post->pre_post_content
turned up nothing, so I’m not sure where you got it from.