The issue
I don’t think it’s any extension related problem, coz it happens in both Login 2 See and Hidden Content extension . For me , it’s more likely due to Flarum itself.
There are two things I notice:
If Synopsis enabled, the hidden content will show directly in discussion page if user haven’t read the post. By reading it and going back to the index page, it is hidden in the summary properly.
The hidden content will automatically reveal. To reproduce :
Open a discussion with hidden content
Drag to the last post
Go back to the first post and u will see the hidden content even user haven’t replied to it .