Oh I see what this is, this happens on long topics.
If the “section” of the topic is not currently loaded then we shut the summary down on click.
Repro is:
- Have a topic with 30 posts
- Go to post 30 direct from home page
- Show summary
- Click on a link that goes to post #1
- Summary closes
Not 100% sure how to sort this out… maybe @keegan has some ideas.