Update: I've figured out the cause!
Posting a comment to the community stream while the article edit page is open in new Athena will cause all content in the article to be erased. It's recoverable with ctrl+z if you do so before navigating away.
However, as far as I know, the only way to have both article edit & community modal open is with authoring CSS to make the top bar accessible while Athena is open. I'm not the only person to have this CSS - it's
very frustrating to have no access to notifications, learn, studio, etc. while working on articles - but I also recognize this bug might only an issue for me because of my customizations.
Updated steps to replicate:
- Open article edit in new Athena
- Open community modal (may require authoring CSS to access without closing Athena)
- Leave a comment
- Return to article
- All content has been erased
- Ctrl+z to recover content