Encountered a bug while importing a database of articles.
If you import
<img src="https://mywebsite.com/image/ss13.jpg" /> tags into a rich text field (with direct urls to the image locations), everything works just fine both in the designer and when published.
However - if you then go in and edit the text field manually and publish the changes, the live site image URLs will automatically be updated to webflow’s own site
<img src="https://global-uploads.webflow.com/image/ss13.jpg" />, even if you didn’t edit the urls or images at all.