**Steps to replicate the issue** (include links if applicable):
* Go to https://en.wikipedia.org/wiki/Wikipedia:Featured_lists
* Go to Appearance
* Enable dark mode
* Click on Report an issue with dark mode
* This should redirect you to [[https://www.mediawiki.org/wiki/Reading/Web/Accessibility_for_reading/Reporting/en.wikipedia.org?section=new&action=submit&preloadtitle=[https://en.wikipedia.org/wiki/Wikipedia:Featured_lists%20Featured%20lists]%20dark%20mode%20error&preload=MediaWiki:vector-night-mode-issue-reporting-preload-content | this page]]
* In the text editor field, switch to visual editing
**What happens?**:
Returning to source editing (in the preview) or simply submitting the report, should show that everything (including the title of your report), was removed except the non-comment text that was in the text editing field before submission //[[ https://www.mediawiki.org/w/index.php?title=Reading/Web/Accessibility_for_reading/Reporting/en.wikipedia.org&oldid=6963935 | (example that showed this issue to me) ]]//
**What should have happened instead?**:
Only new text should be added to the page