Steps to reproduce:
- Enable media library, etc
- Go to node/add/article
- Paste in a very long string of text that ensures that you there are multiple pages of scrolling
- Scroll down to near the end. Inject the media image using the regular button / media library
- After injecting this, note CK5 brings you all the way back to the top of the new article, forcing you to scroll down to find what you were working on.