Related topics missing after rereading a topic with more than 20 posts

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AI-generated summary

Users report a bug where ‘related topics’ disappear after rereading a topic with more than 20 posts, even when jumping back to the first post or scrolling to the end. Moin initially documented the steps to reproduce using a sample topic, noting the issue occurs even in categories like #announcements where users automatically land on the first post after reading. Sam Saffron confirmed the exact repro: with zero unread topics, visiting a topic with >20 replies from post #1 and scrolling to the bottom causes related topics to vanish. He suspects the issue lies in the AI-related code at discourse-ai/lib/embeddings/entry_point.rb, possibly a client-side rendering problem despite data being present in the serializer. Moin later added that the bug persists even when unread topics exist, sharing a video for demonstration. Falco confirmed the issue will be resolved by a pending PR: https://github.com/discourse/discourse-ai/pull/976. Tags: ai, related-topics.

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Steps to reproduce:

  • Visit a topic you have already read, or ensure in another way that you start at the bottom. The topic needs to contain more than 20 posts.
    You can use, for example, Refinements to search being tested on meta - #31 by volanar
  • Jump to the first post because you want to reread the topic (you can use the timeline or the title).
  • Read all the posts until you are at the last post again and notice that the related topics have vanished.

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Scrolling longer topics on mobile doesn't show Related topics at the bottom
Scrolling longer topics on mobile doesn't show Related topics at the bottom
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I’ve just noticed this again at New and improved About page at /about is live. This happens very easily in categories where you land on the first post after reading the whole topic like #announcements . The step of jumping to the first post happens automatically.

1 Like
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Exact repro is:

  1. Have zero unread or new topics.
  2. Visit a topic with more than 20 replies from post #1
  3. Scroll to the bottom, no “related topics”.

This indicates there is a bug here:

This code here:

I meant to catch it, but it is not.

This may be a client side bug where the data lives in the serializer but is not being rendered.

2 Likes
6

Even if you have unread topics the related topics tab is missing

3 Likes
9

Will be fixed by

https://github.com/discourse/discourse-ai/pull/976

3 Likes
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