finomeno on "[Plugin: Frontier Post] No content"

After updating to the latest version a problem surfaced.
When publishing a post, a message appears saying there was no content, and the post is set to draft.
Editing brings up the form with "No content" written in the editor.
Publishing from the edit screen gives the same result.
Thus, no post can actually be published.
Please advise.

https://wordpress.org/plugins/frontier-post/