This is activated within the sanitize_post_field() function:
Calls ‘edit_{$field}’ and ‘{$field_no_prefix}_edit_pre’ passing $value
and $post_id if $context is ‘edit’ and field name prefix is ‘post_’.
So in the case of the post_content_filtered field, the filters are
edit_post_content_filtered
and
content_filtered_edit_pre