Plugin pulls whole post content into schema graph description

Hi,
the Yoast support advised me tho contact you directly. When I look into the code of our customer’s WP page I can see that the whole text of an article shows up in the schema graph as “description”. We translate the page with an automated translation plugin and as this plugin also translates header texts, each post now is translated double (schema graph and post itself). So we need double quota for the translation. Our customer does not use meta descriptions due to the very large amount of posts. Why does the schema graph input does not fall back to the auto-generated Yoast meta description?
You can see it in the source code here: https://simskultur.eu/printemps-des-arts-de-monte-carlo-2023/
Please help how we should go on when no meta description is used.

This is what Yoast told me:

“Maybellyne wrote:

Thanks for the screenshot, as I used it to set up the plugin on my test site. I could replicate the issue where the description in the structured data is pulling all the contents in the post.

The Event Post plugin is responsible for the Event schema you see in our structured data output. Checking the plugin, I don’t see a dedicated field for the event description. This makes the contents of the post be pulled into the Event schema as a description. If you temporarily deactivate the plugin and check again, the description in our structured data output is what you entered as the meta description.

I recommend reaching out to the Event Post plugin developer about fixing the description being pulled into the Event schema.”

Thank you and best regards, Eva

The page I need help with: [log in to see the link]