Bug: creating a threaded reply in the demo crashes

[Dschoordsch]

Start the demo and advance to discussion. Reply to the first task created by the bot

https://parabol.sentry.io/issues/5254489567/?referrer=github_plugin

TypeError: Cannot read properties of undefined (reading '__typename')
  at map (./packages/client/components/ThreadedRepliesList.tsx:65:16)
  at Array.map (<anonymous>)
  at ThreadedRepliesList (./packages/client/components/ThreadedRepliesList.tsx:64:17)
  at Set.forEach (<anonymous>)
...
(30 additional frame(s) were not displayed)

[jordanh]

Prioritizing for triage this cycle

[Dschoordsch]

From tests it looks like #8094

[mattkrick]

Confirmed, this is broken using relay v14.1.0.
Upgrading to relay v18 has fixed this problem, and it does not require upgrading react to v18.
I need to do more QA before upgrading to v18 since there's a lot of breaking changes between v14 & v18.
My suspicion is that relay wasn't using react's scheduler, so react could render a child component before rendering its parent. See facebook/relay#3514 (comment)