What is the exact shortcode you are using on the page?
If you have the Single Template option enabled on the Connections : Settings admin page under the Display tab, disable it.
No, the Google Search Console would not be the cause, but, just maybe, that could be the reason the soft 404’s are being reported. It could be that Google is interpreting the error template not found message and a page not found message.
Hope that helps, let me know.