Guest Author Not Saving on Draft Posts after 3.5.8 update

[mjonasftc]

To recreate:

1. Create a new post
2. Add a Guest Author
3. Remove your own author name (so that the guest author is the only Author)
4. Save the post as a draft
5. Previewing the post
6. Seeing the original WordPress Author as the author on the preview

[GaryJones]

Since we haven't got a block to display a list of coauthors yet, then I think this is still an issue.

[gamebits]

Since we haven't got a block to display a list of coauthors yet, then I think this is still an issue.

I think we now do have that block: #997

Block on backend

Block on frontend

[douglas-johnson]

It seems like the co-authors are being saved to the draft post in the example screenshot provided by @gamebits

The block is only able to represent the data as it exists when the editor is loaded. There isn't a mechanism for fetching new data when the co-authors change... yet. This is the same behavior as categories and tags in the editor.