<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=20999) </details> <!--IssueSummary end--> ### Summary No error is show if loading the autocompletion dropdown in Markdown fields fails. ### Steps to reproduce - go to any Markdown field (for example new comment) - switch off network in browser dev tools - type `/` ### What is the current *bug* behavior? `Loading...` is displayed.  ### What is the expected *correct* behavior? An error is displayed.