I made last code block visible, I didn't add anything that wasn't already in a post. Just the lack of newline rendered it hidden. And I removed "thank-you" part. It was approved by one reviewer, and then rejected by community, apparently without any other edit.
It's been a long time since I suggested edits (I'm mostly on Drupal Answers where I'm 10k+ already), so I admit I have no clue how it works now.