Error when trying to view styleguide

I can't reproduce this either. I read through the stack trace and code, trying to replicate any configuration that I thought might be relevant. The code tries to use the article content type in mock search results. It looks like Layout Builder is in the mix. I tried setting all that up, but had no success.

The bug certainly looks plausible because the style guide is rendering unsaved nodes. My concern is that this is specific to certain configurations. So I'm going to re-close this since it can't be reproduced by maintainers. Anyone can feel free to re-open it, but if you do then please provide steps to reproduce it starting with a fresh install of Drupal Core and the Style Guide module.