I assume you are referring to the structured data plugin
what I did was:
1. setup the amp plugin (amp for wordpress) and chose 'reader' for 'posts'
2. I set up the schema and structured data plugin
3. checked it using the structured data tool
4. i had a few errors in GSC but they went over time
I use the Yoast plugin and I deselected its breadcrumb option (i didn't want it to conflict with the schema and data plugin. don't know if that made a difference or is relevances to you)
i have only used the structured content plugin for the last week or so.
not sure if any of this helps