Basically it broke here about version 0.4.0
So it’s back to using the TinyMCE version of editor.
GB version 0.4.0
The GB plugin has been updated to version 0.4.0.
The details are in the changelog.
New post added.
This is a new post added since it doesn’t look as if I can update an old post that was created in Gutenberg.
Create a new post. Come back to it later and and add some extra text in the same block but you cannot save it and hence update the post. The error message is ‘update failed’
This is added by editing in the old Tiny MCE editor.