Comments are not displayed anymore after replying to them

The current algorithm for displaying comments in the timeline is the following:
1. ChangeRequestSheet loads the full list of discussions and output in an hidden div
2. ChangeRequestSheet loads the full list of events and output each of them
3. A piece of javascript in ChangeRequestSheet is called to iterate on each discussion message and clone and put them in various places: the timeline, the file change tab and the review tab

So the only way to have a discussion being displayed in the timeline, is to have the attached event.

Now when investigating on https://www.xwiki.org/xwiki/bin/view/ChangeRequest/Data/Creating-a-subpage-for-a-Ho-4cbb6c35-80fc-4f8f-80f2-e9b57d52d5ca/ I noticed that there was no event stored for discussion before the 1st of july.

Then it means that either the discussion before the 1st of July were never displayed in the timeline, either the events have been deleted. I checked in XWiki Standard and right now the API for deleting events is only used in legacy mechanism that couldn't impact a subset of the events (it wouldn't have impacted only discussions) and it would cause other problems.

After asking Eleni it's possible that the timeline of this CR never actually displayed the discussion and that they were only displayed in the filechange tab in the past. So I consider for now that it's again a bug related to missing events, and I'll close this ticket as cannot reproduce for now.