A link to OP on CURRENT topic
https://meta.discourse.org/t/what-is-the-reason-the-source-topic-id-that-is-added-to-internal-oneboxes/71722
A link to OP on a different topic
https://meta.discourse.org/t/inconsistent-onebox-rendering/70788
https://meta.discourse.org/t/inconsistent-onebox-rendering/70788