How to stop cross posting hidden EasyDiscuss categories into the activity stream

Hi,
I have Easy Discuss and Easy Social. When I react in Social to a post in Discuss that is a category that other users can't see (It's our staff discussion category) it's allowing others to see the reaction in their social feed along with the truncated part of the post.

How do I make sure the categories that users don't have access to are also protected in the social feed?

Thanks!