Every now and then over-lengthy comment threads increasingly become off-topic to the post or do no longer add value for a specific question. Long comment threads will raise a moderator flag to make sure the clean-up of comments takes place. Moderators are expected to delete outdated comments.
In case some issues are of value still, the discussion becomes increasingly off topic to the question, or issues were not yet entirely resolved we have the option to rather than just delete move all comments to an own chat room created for this purpose only. If that happened we see an auto-comment like this one
This will be a link to the newly created chat room. If we come back to the question after a while it may happen however, that this link leads to Stack Exchange "page not found" page.
What can we do to avoid this?