I've raised this concern 2 years back but I was not clear that time: https://community.peerboard.com/post/1480597898
The issue still persists. Here's a video:
https://i.imgur.com/x7LitJr.mp4
Even if you delete the entire content of post, that code block won't go away. The only way is to add some text, select it and then disable code, which is a really frustrating process for a small task.